01c shell
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The document provides an overview of basic shell syntax and commands in UNIX shells. It discusses command line options, how shells find commands, aliases, standard input/output redirection, running jobs in background, pattern matching, switching shells, and combining multiple commands. Key points covered include using options and arguments with commands, the PATH variable, built-in commands, piping output, redirecting I/O, listing and managing jobs, wildcard patterns, and grouping commands.
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Job Control :
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$
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#include
#include
#include
#include
#include
#include
using namespace std;
int change_dir(char* args[])
{
if (args[1] == NULL)
{
chdir(getenv(\"HOME\"));
return 1;
}
else
{
if (chdir(args[1]) == -1)
{
cout << \"No such directory\" << args[1];
return -1;
}
}
return 0;
}
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cout << \"Builtin commands so far are; cd, and help.\ \";
return 0;
}
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{
while(true)
{
cout << \"$ \";
char cmd[128];
cin.getline(cmd,128);
vector args;
char *line = strtok(cmd, \" \");
char *tmp = line;
while (tmp != NULL)
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args.push_back(tmp);
tmp = strtok(NULL, \" \");
}
char** argv = new char*[args.size() + 1];
for (int i = 0; i < args.size(); i++)
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{
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pid_t pid;
pid_t wpid;
int status;
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signal(SIGTERM, SIG_DFL);
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}
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#include
#include
#include
#include
#include
using namespace std;
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if (args[1] == NULL)
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chdir(getenv(\"HOME\"));
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cout << \"No such directory\" << args[1];
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}
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{
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