Linux cron - crontab - temp files
•
1 like•46 views
Quick notes on Linux cron scheduler and temp files management. From the curriculum of RH134 and Red Hat Certified Systems Administrator (RHCSA)
Report
Share
Report
Share
Download to read offline
![at
26 queues, a to z, with jobs in alphabetically later queues
getting less system priority
time format
at 7:30 PM Tue
warning: commands will be executed using /bin/sh
at> echo "I am the super redhat administrator."
at> ^D
job 1 at Tue Feb 20 09:30:00 2018
atq / at -l
atrm / at -r
at -c
at -q [letter]
Managing temp files
systemd-tmpfiles --clean --create --remove--
man 5 tmpfiles.d
at-cron Page 2](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Recommended
LinuxTag 2010 - Advanced Software Management with RPM
This document summarizes a talk on advanced software management using RPM packages. It discusses how ImmobilienScout24 automated their deployment and configuration across 600 servers by converting their existing software and configurations into RPM packages. This allowed them to manage software and system configurations through yum and achieve faster, standardized deployments and updates across their infrastructure. The talk covered their proof of concept for modeling their setup using RPM packages, configuration management through templating, and controlling systems through SSH and Linux commands.
Heroku's Ryan Smith at Waza 2013: Predictable Failure
Heroku's Ryan Smith took to the Waza 2013 stage to present "Predictable Failure" -- a look at how engineers can prepare for the inevitable. For more from Smith ping him at @ryandotsmith.
For Waza videos stay tuned at http://blog.heroku.com or visit http://vimeo.com/herokuwaza
Qemu - Raspberry | while42 Singapore #2
This document provides instructions for running a Qemu virtual machine emulating a Raspberry Pi using a chroot jail. It explains that Qemu can emulate CPUs through dynamic binary translation and run unmodified guest operating systems. It then provides steps to compile Qemu for ARM emulation, download a Raspbian image, mount it read-write in Qemu, enlarge the disk size, create a chroot jail within the virtual disk, and test that the chroot jail is running like a real Raspberry Pi system.
Jonson"s Rule Production scheduling
The document discusses various production planning and scheduling concepts including:
1. A bill of materials (BOM) lists raw materials, components, parts, and quantities needed to manufacture a product in a hierarchical structure.
2. Forward and backward scheduling involve planning tasks from different directions - forward from resource availability to due date, backward from due date to start date.
3. Aggregate planning develops a preliminary schedule of overall operations including sales, production, inventory, and backlogs to help synchronize supply chain flow.
Sequencing problems in Operations Research
The document discusses sequencing problems and various sequencing rules used to optimize outputs when assigning jobs to machines. It describes Johnson's rule for minimizing completion time when scheduling jobs on two workstations. Johnson's rule involves scheduling the job with the shortest processing time first at the workstation where it finishes earliest. It provides an example of applying Johnson's rule to schedule five motor repair jobs at the Morris Machine Company across two workstations. Finally, it discusses Johnson's three machine rule for sequencing jobs across three machines.
Linux DVD 03 Learnkey linux+ setup
This document discusses Linux commands for viewing running processes including ps -e to see everything, ps -p1 to see a specific process, and killall to end processes. It also mentions restarting processes and viewing process sizes graphically.
Homework solutionsch9
The document contains solutions to chapter 9 homework problems involving scheduling algorithms. Problem 9.16 asks to calculate turnaround times and average turnaround time for 5 batch jobs (A-E) using different scheduling algorithms: (a) round robin with 1 minute time quantum, (b) priority scheduling based on predefined priorities, (c) FCFS, (d) shortest job next. For each algorithm, the turnaround times for each job and the average are provided.
Pipeline processing and space time diagram
Pipeline processing breaks down sequential processes into sub-operations that execute concurrently in dedicated segments. It is illustrated using a space-time diagram that shows segment utilization over time. For a K-segment pipeline with a clock cycle tp, the first task takes Ktp to complete while remaining tasks finish every tp, with all N tasks completing in (K+N-1)tp time.
Recommended
LinuxTag 2010 - Advanced Software Management with RPM
This document summarizes a talk on advanced software management using RPM packages. It discusses how ImmobilienScout24 automated their deployment and configuration across 600 servers by converting their existing software and configurations into RPM packages. This allowed them to manage software and system configurations through yum and achieve faster, standardized deployments and updates across their infrastructure. The talk covered their proof of concept for modeling their setup using RPM packages, configuration management through templating, and controlling systems through SSH and Linux commands.
Heroku's Ryan Smith at Waza 2013: Predictable Failure
Heroku's Ryan Smith took to the Waza 2013 stage to present "Predictable Failure" -- a look at how engineers can prepare for the inevitable. For more from Smith ping him at @ryandotsmith.
For Waza videos stay tuned at http://blog.heroku.com or visit http://vimeo.com/herokuwaza
Qemu - Raspberry | while42 Singapore #2
This document provides instructions for running a Qemu virtual machine emulating a Raspberry Pi using a chroot jail. It explains that Qemu can emulate CPUs through dynamic binary translation and run unmodified guest operating systems. It then provides steps to compile Qemu for ARM emulation, download a Raspbian image, mount it read-write in Qemu, enlarge the disk size, create a chroot jail within the virtual disk, and test that the chroot jail is running like a real Raspberry Pi system.
Jonson"s Rule Production scheduling
The document discusses various production planning and scheduling concepts including:
1. A bill of materials (BOM) lists raw materials, components, parts, and quantities needed to manufacture a product in a hierarchical structure.
2. Forward and backward scheduling involve planning tasks from different directions - forward from resource availability to due date, backward from due date to start date.
3. Aggregate planning develops a preliminary schedule of overall operations including sales, production, inventory, and backlogs to help synchronize supply chain flow.
Sequencing problems in Operations Research
The document discusses sequencing problems and various sequencing rules used to optimize outputs when assigning jobs to machines. It describes Johnson's rule for minimizing completion time when scheduling jobs on two workstations. Johnson's rule involves scheduling the job with the shortest processing time first at the workstation where it finishes earliest. It provides an example of applying Johnson's rule to schedule five motor repair jobs at the Morris Machine Company across two workstations. Finally, it discusses Johnson's three machine rule for sequencing jobs across three machines.
Linux DVD 03 Learnkey linux+ setup
This document discusses Linux commands for viewing running processes including ps -e to see everything, ps -p1 to see a specific process, and killall to end processes. It also mentions restarting processes and viewing process sizes graphically.
Homework solutionsch9
The document contains solutions to chapter 9 homework problems involving scheduling algorithms. Problem 9.16 asks to calculate turnaround times and average turnaround time for 5 batch jobs (A-E) using different scheduling algorithms: (a) round robin with 1 minute time quantum, (b) priority scheduling based on predefined priorities, (c) FCFS, (d) shortest job next. For each algorithm, the turnaround times for each job and the average are provided.
Pipeline processing and space time diagram
Pipeline processing breaks down sequential processes into sub-operations that execute concurrently in dedicated segments. It is illustrated using a space-time diagram that shows segment utilization over time. For a K-segment pipeline with a clock cycle tp, the first task takes Ktp to complete while remaining tasks finish every tp, with all N tasks completing in (K+N-1)tp time.
Troubleshooting linux booting process
Quick notes on Linux troubleshooting booting process . From the curriculum of RH134 and Red Hat Certified Systems Administrator (RHCSA)
Linux Security with SElinux
SElinux provides mandatory access controls that confine processes and restrict access between processes and files based on security contexts. It operates by default in enforcing mode, where no access is allowed unless explicitly granted by a policy rule. Users can view and manage security contexts, booleans that toggle rules, and troubleshoot issues using various GUI and command line tools.
Linux File System Partitioning
The document discusses disk partitioning and some key differences between MBR and GPT partitioning schemes. It covers maximum partition and disk size limits imposed by 32-bit versus 64-bit addressing, as well as the increased number of partitions supported by GPT. It also briefly mentions journaling, swap partitions, and tools used to manage partitions like fdisk, gdisk, and mkswap.
Linux LVM Logical Volume Management
Quick notes on Linux Logical Volume Management. From the curriculum of RH134 and Red Hat Certified Systems Administrator (RHCSA)
Linux grep and regex
Quick notes on Linux grep and regex. From the curriculum of RH134 and Red Hat Certified Systems Administrator (RHCSA)
RedHat - Centos Firewalld
Quick notes on Linux RedHat/Centos firewalld service. From the curriculum of RH134 and Red Hat Certified Systems Administrator (RHCSA)
BÀI TẬP BỔ TRỢ TIẾNG ANH 8 CẢ NĂM - GLOBAL SUCCESS - NĂM HỌC 2023-2024 (CÓ FI...
BÀI TẬP BỔ TRỢ TIẾNG ANH 8 CẢ NĂM - GLOBAL SUCCESS - NĂM HỌC 2023-2024 (CÓ FI...Nguyen Thanh Tu Collection
https://app.box.com/s/y977uz6bpd3af4qsebv7r9b7s21935vdPengantar Penggunaan Flutter - Dart programming language1.pptx
Pengantar Penggunaan Flutter - Dart programming language1.pptx
The History of Stoke Newington Street Names
Presented at the Stoke Newington Literary Festival on 9th June 2024
www.StokeNewingtonHistory.com
Your Skill Boost Masterclass: Strategies for Effective Upskilling
Your Skill Boost Masterclass: Strategies for Effective UpskillingExcellence Foundation for South Sudan
Strategies for Effective Upskilling is a presentation by Chinwendu Peace in a Your Skill Boost Masterclass organisation by the Excellence Foundation for South Sudan on 08th and 09th June 2024 from 1 PM to 3 PM on each day.How to Manage Your Lost Opportunities in Odoo 17 CRM
Odoo 17 CRM allows us to track why we lose sales opportunities with "Lost Reasons." This helps analyze our sales process and identify areas for improvement. Here's how to configure lost reasons in Odoo 17 CRM
Chapter 4 - Islamic Financial Institutions in Malaysia.pptx
Chapter 4 - Islamic Financial Institutions in Malaysia.pptxMohd Adib Abd Muin, Senior Lecturer at Universiti Utara Malaysia
This slide is special for master students (MIBS & MIFB) in UUM. Also useful for readers who are interested in the topic of contemporary Islamic banking.
How to Add Chatter in the odoo 17 ERP Module
In Odoo, the chatter is like a chat tool that helps you work together on records. You can leave notes and track things, making it easier to talk with your team and partners. Inside chatter, all communication history, activity, and changes will be displayed.
PCOS corelations and management through Ayurveda.
This presentation includes basic of PCOS their pathology and treatment and also Ayurveda correlation of PCOS and Ayurvedic line of treatment mentioned in classics.
How to Create a More Engaging and Human Online Learning Experience
How to Create a More Engaging and Human Online Learning Experience Wahiba Chair Training & Consulting
Wahiba Chair's Talk at the 2024 Learning Ideas Conference. The Diamonds of 2023-2024 in the IGRA collection
A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
Main Java[All of the Base Concepts}.docx
This is part 1 of my Java Learning Journey. This Contains Custom methods, classes, constructors, packages, multithreading , try- catch block, finally block and more.
BBR 2024 Summer Sessions Interview Training
Qualitative research interview training by Professor Katrina Pritchard and Dr Helen Williams
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UP
This Dissertation explores the particular circumstances of Mirzapur, a region located in the
core of India. Mirzapur, with its varied terrains and abundant biodiversity, offers an optimal
environment for investigating the changes in vegetation cover dynamics. Our study utilizes
advanced technologies such as GIS (Geographic Information Systems) and Remote sensing to
analyze the transformations that have taken place over the course of a decade.
The complex relationship between human activities and the environment has been the focus
of extensive research and worry. As the global community grapples with swift urbanization,
population expansion, and economic progress, the effects on natural ecosystems are becoming
more evident. A crucial element of this impact is the alteration of vegetation cover, which plays a
significant role in maintaining the ecological equilibrium of our planet.Land serves as the foundation for all human activities and provides the necessary materials for
these activities. As the most crucial natural resource, its utilization by humans results in different
'Land uses,' which are determined by both human activities and the physical characteristics of the
land.
The utilization of land is impacted by human needs and environmental factors. In countries
like India, rapid population growth and the emphasis on extensive resource exploitation can lead
to significant land degradation, adversely affecting the region's land cover.
Therefore, human intervention has significantly influenced land use patterns over many
centuries, evolving its structure over time and space. In the present era, these changes have
accelerated due to factors such as agriculture and urbanization. Information regarding land use and
cover is essential for various planning and management tasks related to the Earth's surface,
providing crucial environmental data for scientific, resource management, policy purposes, and
diverse human activities.
Accurate understanding of land use and cover is imperative for the development planning
of any area. Consequently, a wide range of professionals, including earth system scientists, land
and water managers, and urban planners, are interested in obtaining data on land use and cover
changes, conversion trends, and other related patterns. The spatial dimensions of land use and
cover support policymakers and scientists in making well-informed decisions, as alterations in
these patterns indicate shifts in economic and social conditions. Monitoring such changes with the
help of Advanced technologies like Remote Sensing and Geographic Information Systems is
crucial for coordinated efforts across different administrative levels. Advanced technologies like
Remote Sensing and Geographic Information Systems
9
Changes in vegetation cover refer to variations in the distribution, composition, and overall
structure of plant communities across different temporal and spatial scales. These changes can
occur natural.
South African Journal of Science: Writing with integrity workshop (2024)
South African Journal of Science: Writing with integrity workshop (2024)Academy of Science of South Africa
A workshop hosted by the South African Journal of Science aimed at postgraduate students and early career researchers with little or no experience in writing and publishing journal articles.More Related Content
More from Manolis Kartsonakis
Troubleshooting linux booting process
Quick notes on Linux troubleshooting booting process . From the curriculum of RH134 and Red Hat Certified Systems Administrator (RHCSA)
Linux Security with SElinux
SElinux provides mandatory access controls that confine processes and restrict access between processes and files based on security contexts. It operates by default in enforcing mode, where no access is allowed unless explicitly granted by a policy rule. Users can view and manage security contexts, booleans that toggle rules, and troubleshoot issues using various GUI and command line tools.
Linux File System Partitioning
The document discusses disk partitioning and some key differences between MBR and GPT partitioning schemes. It covers maximum partition and disk size limits imposed by 32-bit versus 64-bit addressing, as well as the increased number of partitions supported by GPT. It also briefly mentions journaling, swap partitions, and tools used to manage partitions like fdisk, gdisk, and mkswap.
Linux LVM Logical Volume Management
Quick notes on Linux Logical Volume Management. From the curriculum of RH134 and Red Hat Certified Systems Administrator (RHCSA)
Linux grep and regex
Quick notes on Linux grep and regex. From the curriculum of RH134 and Red Hat Certified Systems Administrator (RHCSA)
RedHat - Centos Firewalld
Quick notes on Linux RedHat/Centos firewalld service. From the curriculum of RH134 and Red Hat Certified Systems Administrator (RHCSA)
More from Manolis Kartsonakis (6)
Recently uploaded
BÀI TẬP BỔ TRỢ TIẾNG ANH 8 CẢ NĂM - GLOBAL SUCCESS - NĂM HỌC 2023-2024 (CÓ FI...
BÀI TẬP BỔ TRỢ TIẾNG ANH 8 CẢ NĂM - GLOBAL SUCCESS - NĂM HỌC 2023-2024 (CÓ FI...Nguyen Thanh Tu Collection
https://app.box.com/s/y977uz6bpd3af4qsebv7r9b7s21935vdPengantar Penggunaan Flutter - Dart programming language1.pptx
Pengantar Penggunaan Flutter - Dart programming language1.pptx
The History of Stoke Newington Street Names
Presented at the Stoke Newington Literary Festival on 9th June 2024
www.StokeNewingtonHistory.com
Your Skill Boost Masterclass: Strategies for Effective Upskilling
Your Skill Boost Masterclass: Strategies for Effective UpskillingExcellence Foundation for South Sudan
Strategies for Effective Upskilling is a presentation by Chinwendu Peace in a Your Skill Boost Masterclass organisation by the Excellence Foundation for South Sudan on 08th and 09th June 2024 from 1 PM to 3 PM on each day.How to Manage Your Lost Opportunities in Odoo 17 CRM
Odoo 17 CRM allows us to track why we lose sales opportunities with "Lost Reasons." This helps analyze our sales process and identify areas for improvement. Here's how to configure lost reasons in Odoo 17 CRM
Chapter 4 - Islamic Financial Institutions in Malaysia.pptx
Chapter 4 - Islamic Financial Institutions in Malaysia.pptxMohd Adib Abd Muin, Senior Lecturer at Universiti Utara Malaysia
This slide is special for master students (MIBS & MIFB) in UUM. Also useful for readers who are interested in the topic of contemporary Islamic banking.
How to Add Chatter in the odoo 17 ERP Module
In Odoo, the chatter is like a chat tool that helps you work together on records. You can leave notes and track things, making it easier to talk with your team and partners. Inside chatter, all communication history, activity, and changes will be displayed.
PCOS corelations and management through Ayurveda.
This presentation includes basic of PCOS their pathology and treatment and also Ayurveda correlation of PCOS and Ayurvedic line of treatment mentioned in classics.
How to Create a More Engaging and Human Online Learning Experience
How to Create a More Engaging and Human Online Learning Experience Wahiba Chair Training & Consulting
Wahiba Chair's Talk at the 2024 Learning Ideas Conference. The Diamonds of 2023-2024 in the IGRA collection
A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
Main Java[All of the Base Concepts}.docx
This is part 1 of my Java Learning Journey. This Contains Custom methods, classes, constructors, packages, multithreading , try- catch block, finally block and more.
BBR 2024 Summer Sessions Interview Training
Qualitative research interview training by Professor Katrina Pritchard and Dr Helen Williams
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UP
This Dissertation explores the particular circumstances of Mirzapur, a region located in the
core of India. Mirzapur, with its varied terrains and abundant biodiversity, offers an optimal
environment for investigating the changes in vegetation cover dynamics. Our study utilizes
advanced technologies such as GIS (Geographic Information Systems) and Remote sensing to
analyze the transformations that have taken place over the course of a decade.
The complex relationship between human activities and the environment has been the focus
of extensive research and worry. As the global community grapples with swift urbanization,
population expansion, and economic progress, the effects on natural ecosystems are becoming
more evident. A crucial element of this impact is the alteration of vegetation cover, which plays a
significant role in maintaining the ecological equilibrium of our planet.Land serves as the foundation for all human activities and provides the necessary materials for
these activities. As the most crucial natural resource, its utilization by humans results in different
'Land uses,' which are determined by both human activities and the physical characteristics of the
land.
The utilization of land is impacted by human needs and environmental factors. In countries
like India, rapid population growth and the emphasis on extensive resource exploitation can lead
to significant land degradation, adversely affecting the region's land cover.
Therefore, human intervention has significantly influenced land use patterns over many
centuries, evolving its structure over time and space. In the present era, these changes have
accelerated due to factors such as agriculture and urbanization. Information regarding land use and
cover is essential for various planning and management tasks related to the Earth's surface,
providing crucial environmental data for scientific, resource management, policy purposes, and
diverse human activities.
Accurate understanding of land use and cover is imperative for the development planning
of any area. Consequently, a wide range of professionals, including earth system scientists, land
and water managers, and urban planners, are interested in obtaining data on land use and cover
changes, conversion trends, and other related patterns. The spatial dimensions of land use and
cover support policymakers and scientists in making well-informed decisions, as alterations in
these patterns indicate shifts in economic and social conditions. Monitoring such changes with the
help of Advanced technologies like Remote Sensing and Geographic Information Systems is
crucial for coordinated efforts across different administrative levels. Advanced technologies like
Remote Sensing and Geographic Information Systems
9
Changes in vegetation cover refer to variations in the distribution, composition, and overall
structure of plant communities across different temporal and spatial scales. These changes can
occur natural.
South African Journal of Science: Writing with integrity workshop (2024)
South African Journal of Science: Writing with integrity workshop (2024)Academy of Science of South Africa
A workshop hosted by the South African Journal of Science aimed at postgraduate students and early career researchers with little or no experience in writing and publishing journal articles.RHEOLOGY Physical pharmaceutics-II notes for B.pharm 4th sem students
Physical pharmaceutics notes for B.pharm students
clinical examination of hip joint (1).pdf
described clinical examination all orthopeadic conditions .
Recently uploaded (20)
BÀI TẬP BỔ TRỢ TIẾNG ANH 8 CẢ NĂM - GLOBAL SUCCESS - NĂM HỌC 2023-2024 (CÓ FI...
BÀI TẬP BỔ TRỢ TIẾNG ANH 8 CẢ NĂM - GLOBAL SUCCESS - NĂM HỌC 2023-2024 (CÓ FI...
Pengantar Penggunaan Flutter - Dart programming language1.pptx
Pengantar Penggunaan Flutter - Dart programming language1.pptx
Your Skill Boost Masterclass: Strategies for Effective Upskilling
Your Skill Boost Masterclass: Strategies for Effective Upskilling
How to Manage Your Lost Opportunities in Odoo 17 CRM
How to Manage Your Lost Opportunities in Odoo 17 CRM
Chapter 4 - Islamic Financial Institutions in Malaysia.pptx
Chapter 4 - Islamic Financial Institutions in Malaysia.pptx
How to Create a More Engaging and Human Online Learning Experience
How to Create a More Engaging and Human Online Learning Experience
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UP
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UP
South African Journal of Science: Writing with integrity workshop (2024)
South African Journal of Science: Writing with integrity workshop (2024)
RHEOLOGY Physical pharmaceutics-II notes for B.pharm 4th sem students
RHEOLOGY Physical pharmaceutics-II notes for B.pharm 4th sem students
Digital Artefact 1 - Tiny Home Environmental Design
Digital Artefact 1 - Tiny Home Environmental Design
Linux cron - crontab - temp files
- 2. at 26 queues, a to z, with jobs in alphabetically later queues getting less system priority time format at 7:30 PM Tue warning: commands will be executed using /bin/sh at> echo "I am the super redhat administrator." at> ^D job 1 at Tue Feb 20 09:30:00 2018 atq / at -l atrm / at -r at -c at -q [letter] Managing temp files systemd-tmpfiles --clean --create --remove-- man 5 tmpfiles.d at-cron Page 2