linux operating system

How do I add a user to group under Ubuntu Linux operating system using command line options?

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I‘d like to send an email with the content of a text file using mail command in Unix / Linux operating system. How do I do it?

{ 13 comments }

How do I open the TCP or UDP ports under UNIX / Linux like operating systems?

{ 8 comments }

How do I find out file size under UNIX / Linux operating system and store the same to a variable called s?

{ 9 comments }

How do I find out if a file is more than one hour old in a UNIX shell and take action on all matching file such as delete or move files.

{ 2 comments }

I am a new Unix shell user at my university shell server. Accidentally, I had created a file called -foo. Now, how do I remove a file with a name starting with ‘-‘ under UNIX-like or Linux operating system?

{ 6 comments }

How do I format and connect to an iSCSI Volume under Debian / Ubuntu Linux?

{ 37 comments }