Unix Notes

1. Logged in = What to do
Who= who logged into the system The users and hosts
Pwd =print woring directory= lists the current working directory
Ls = lists all the directories files and sub directories –f –r and other options to remove the
unwanted expressions that also come in the result
Handling Files
Head [ -10] file1 = Shows the first 10 lines of the file
More file1= Shows more content of the file
Tail file1 = Shows the lasat few lines of the file
Ed file1 = Editor for the file to create/edit
Sed = Stream editor for editing the file
Vi = Editing the file and saving it
Mv file1 to file2 = Move the file into another
Cp file1 file2 = Write contents od file1 into file2
Awk file1 = Search for patterns in the file and process the results
Handling Directories
Chown = Change ownership of the
Chmod = Change file or directory access permissions
Mkdir = Creating new directory
Rmdir = Removing the directory
Handling Processes
Ps = show the active processes involved
Kill #pid = kill the process with specified pid
String Manipulation Commands

2. Grep ‘search string’ file1 = Search for the occurance of the string in the file
Wc file1 = Find the number of words in the file
Server Connection Commands
telnet [host port ] =Used to communicate with other hosts present in the server.
ftp host = Transfer files using file transfer protocol