Commands using diff (119)

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check open ports without netstat or lsof

Edit the last or previous command line in an editor then execute
If you would like to edit a previous command, which might be long and complicated, you can use the fc (I think it stands for fix command). Invoke fc alone will edit the last command using the default editor (specified by $FCEDIT, $EDITOR, or emacs, in that order). After you make the changes in the editor, save and exit to execute that command. The fc command is more flexible than what I have described. Please 'man bash' for more information.

Find the package that installed a command

Record microphone input and output to date stamped mp3 file
record audio notes or meetings requires arecord and lame run mp3gain on the resulting file to increase the volume / quality ctrl-c to stop recording

One liner to kill a process when knowing only the port where the process is running
-k (kill option ) . To kill all processes accessing this port

look for a function reference in a library set

Detect encoding of a text file
This command gives you the charset of a text file, which would be handy if you have no idea of the encoding.

Recursively search and replace old with new string, inside every instance of filename.ext
This is a slightly modified version of http://www.commandlinefu.com/commands/view/4283/recursive-search-and-replace-old-with-new-string-inside-files (which did not work due to incorrect syntax) with the added option to sed inside only files named filename.ext

SED - Substitute string in next line
source: http://sed.sourceforge.net/sed1line.txt

Display a list of RPMs installed on a particular date
Find out which RPMs were installed on a particular date. These would (naturally) include update RPMs. This example shows searching for "Thu 05 Mar" (with grep). Alternatively, pipe it to less so you can search inside less (with less's neat text highlighting of the search term): rpm -qa --queryformat '%{installtime} \"%{vendor}\" %{name}-%{version}-%{release} %{installtime:date}\n' | less # (this example) search term: Thu 05 Mar


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