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How can I run a shell command in Perl script and return the result?

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How can I run a shell command in Perl script and return the result?

From Perl HowTo, the most common ways to execute external commands from Perl are:

  1. my $files = `ls -la` — captures the output of the command in $files.
  2. system “touch ~/foo” — if you don’t want to capture the command’s output.
  3. exec “vim ~/foo” — if you don’t want to return to the script after executing the command.

What is system command in Perl?

Perl’s system command provides a way to execute a shell command on the underlying platform. For example, if you are running on a Unix platform, the command: system(“ls -l”) will print a long listing of files to stdout.

How do I run a shell command in Perl?

How to execute Unix/shell commands in a Perl script?

  1. exec”” syntax: exec “command”;
  2. system() syntax: system( “command” );
  3. Backticks “ or qx// syntax: `command`;
  4. IPC::Open2. syntax: $output = open2(\*CHLD_OUT, \*CHLD_IN, ‘command arg1 arg2’ );
  5. IPC::Open3.

How can perl be used to invoke system commands?

With Perl, the backtick operator (see the examples below) is one of the ways in which you can access system commands. To use this feature in Perl you just put the command that you want to execute between the backticks — that’s it. This runs the command, then you can easily access the command output.

How does system() function work in Perl?

Perl’s system () function executes a system shell command. Here the parent process forks a child process, and then waits for the child process to terminate. The command will either succeed or fail returning a value for each situation.

How do I execute external commands from Perl?

There are many ways to execute external commands from Perl. The most commons with their meanings are: system(): you want to execute a command and don’t want to capture its output exec: you don’t want to return to the calling perl script backticks: you want to capture the output of the command

How to read an Excel file in Perl?

Excel files can be created with the use of Perl by the help of an inbuilt module Excel::Writer::XLSX which is used to create Excel files. Further, write () function is used to add content to the excel file. Reading of an Excel File in Perl is done by using Spreadsheet::Read module in a Perl script.

How to get the exit status of a Perl program?

Points to Keep in Mind While Using Perl System Command. The return value of this function is the exit status of the program. The latter is returned by the wait function. In order to get the actual exit value divide the present value by the number 256.

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