Useful yet underutilized commandsSun 30 March 2008 by Thejaswi Puthraya
Useful yet underutilized commands
Recently, I have started looking towards system programming (thanks to my arm processor project). While I was glancing through the manual pages, I noticed these commands that are extremely useful but rarely used (or probably implicity used).
Here they are:
- csplit: split a file into sections determined by context lines
Very useful command. Helps breaking a file according to regexps, number of lines etc.
- expand: convert tabs to spaces
Another useful command especially in the python world where they specifically discourage the use of tabs and prefer 4 spaces.
- fold: wrap each input line to fit in specified width
Useful while getting your code to fit the terminal window or to fit PEP 8.
- fuser: identify processes using files or sockets
Had used this command earlier but didn't know that it could be used for TCP sockets also.
- iconv: Convert encoding of given files from one encoding to another
Very useful. Recently this came handy coverting ISO88952 to UTF8.
- join: join lines of two files on a common field
A life-saver sometimes.
- nl: number lines of files
A super sexy utility that prints the line number to the left of the code.
Will write about more commands as I come across them.