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Command Line Tools (GNU and others)

Proposed Q&A site for users and developers of Open Source command line tools like awk, vim, bash, less, seq, bc, top and kill.
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14 Example Questions

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up vote 12 down vote
How to mass-rename the list of files using regexp replace in single line?
added by volkerjaan Oct 3 '12 at 21:56
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up vote 9 down vote
What is the difference between cURL and Wget?
added by Adam Matan, edited by WikiSpeedia hang-around Sep 27 '12 at 17:02
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2  
Perhaps "*What* is the difference between curl and wget?" would be a better question. – Keith Thompson Sep 25 '12 at 4:25
Thanks, changed. – Adam Matan Oct 6 '12 at 13:02
up vote 8 down vote
Can I choose the sorting algorithm of sort?
added by Adam Matan Sep 23 '12 at 8:58
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I'd really love to know this. I just learned that AIX with Danish locale puts AA after Z. How's that for portability! – alex Feb 6 at 2:09
up vote 8 down vote
What command line options should ideally be supported by every command line tool?
added by celtschk Sep 26 '12 at 12:12
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up vote 5 down vote
Count words that match a regex in wc
added by Adam Matan Sep 23 '12 at 8:56
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sed "s:\(REGEX\):\n\1:g" FILE | grep "^REGEX" | wc -l – alex Feb 6 at 2:12
up vote 5 down vote
How to sort for "human readable" sizes as output by the -h option of du?
added by celtschk Sep 23 '12 at 11:55
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up vote 3 down vote
How do I do case-insensitive search-replace in Vim?
added by Adam Matan, edited by WikiSpeedia hang-around Sep 27 '12 at 17:01
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1  
I wouldn't consider vim a command line tool. It is a full-fledged application (namely, an editor), which just happens to run on the terminal instead of a GUI. – celtschk Oct 15 '12 at 9:02
Maybe not a command line exactly, but so often i process data through, sed, awk, to a file, open it in vi, run some macros, :wq (ZZ) and perhaps execute the file as a script. Vi is so fast to open and close that it's a bit like shell interactive mode. – alex Jan 11 at 4:11
I'd really like to know the answer to this. /[hH][eE][Ll][Ll][Oo] is a pain in the ars... isuppose /hello/i might wwork. Must try on my Nondroid. – alex Jan 11 at 4:19
up vote 2 down vote
Is there a way for Bash to send the external commands to another program like GDB instead of the operating system (so it acts as front end to it)?
added by celtschk, edited by WikiSpeedia hang-around Sep 27 '12 at 17:02
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up vote 2 down vote
What is more efficient to get part of lines containing a string? grep + cut or awk?
added by David Kohen Dec 8 '12 at 12:35
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up vote 2 down vote
Is there an easy way to obfuscate public passwords? A la rot13 but a bit more robust: $ encrypt mYkEy password
added by alex Jan 11 at 4:16
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up vote 1 down vote
Can i execute vim macros via pipe from the command line?
added by alex Jan 11 at 4:22
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up vote 0 down vote
Please help me reduce excessive use of cat to pipe into other commands
added by alex Jan 11 at 4:00
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up vote 0 down vote
How can i install basic GNU utilities on AIX?
added by alex Jan 11 at 4:07
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up vote 0 down vote
How do I find out which command line tools are installed on my system?
added by sarahm May 3 at 21:25
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