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I have a problem with the system function. I want to store the system functions output to a variable.
For example,
system("ls"); Here I want all the file names in the current directory to store in a variable. I know that I can do this by redirecting the output into a file and read from that and store that to a variable. But I want a efficient way than that. Is there any way .
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The easiest way is to use the `` feature in Perl. This will execute what is inside and return what was printed to stdout: my $pid = 5892; my $var = `top -H -p $pid -n 1 | grep myprocess | wc -l`; print "not = $var\n"; This should do it.
Perl's System Command It returns 0 if the command succeeds and 1 if it fails. These return values are the inverse of most commands, which typically return 0 when they fail and 1 when they succeed.
PERL QX FUNCTION. Description. This function is a alternative to using back-quotes to execute system commands. For example, qx ls − l will execute the UNIX ls command using the -l command-line option. You can actually use any set of delimiters, not just the parentheses.
From Perl HowTo, the most common ways to execute external commands from Perl are: my $files = `ls -la` — captures the output of the command in $files. system "touch ~/foo" — if you don't want to capture the command's output. exec "vim ~/foo" — if you don't want to return to the script after executing the command.
No, you cannot store the values of the ls output , since system always execute the command as a child process , so try with backtick `command` which executes the command in the current process itself!
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