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Nikhil primarily works as a Ruby application developer with ThoughtWorks. He enjoys writing fast web-apps as much as he likes writing Chef cookbooks. He also digs everything that is GNU/Linux/Emacs. Professionally, he's worked on several offshore development projects and knows the challenges of working with distributed agile teams and enterprise data centers. He blogs at blog.hyfather.com and tweets using @hyfather. Nikhil has posted 4 posts at DZone. You can read more from them at their website. View Full User Profile

Time Saving Bash Tricks

01.15.2012
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This is a followup from the lightning talk '5 Time Saving Bash Tricks' at DevOpsDays, Bangalore 2011.

 

These work with the emacs-readline, which is the default configuration in most ditributions (including OS X).

  • C means Control
  • M means Meta (usually mapped to Alt/Option or Escape on QWERTY keyboards.)

 

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`M` stands for the Meta key. Commonly represented by the Alt/Option/Esc key on your keyboard.
`C` stands for the Control key.
Example -- `C-k` means 'hit `k` while keeping `Control` pressed.'
`M-.`
Yank the last argument to the previous command.
`M-C-y`
Yank the first argument to the previous command.
`C-k, C-w, M-d, C-u`
All these kill text in different ways and save it in the kill-ring.
`C-y`
Yank most recent item from the kill-ring.
`M-y`
Immediately follows a `C-y`. Cycle through the kill-ring.
`!!`
Substitute the previous command (e.g. `sudo !!`)

 

SSH multiplexing

~/.ssh/config

 

Host *

ControlMaster auto

ControlPath /tmp/%r0%h:%p

 

 

Ensuring Bash Hisory across multiple sessions

~/.bashrc

shopt -s histappend

 

Remember to use pushd and popd when in deeply nested directories.

 

Background tail processes to share STDOUT and STDERR with any REPL (including the shell itself.)

tail -f httpd.log &

Then start the REPL, or continue working on the shell. 

 Source:  http://blog.hyfather.com/time-saving-bash-tricks

Published at DZone with permission of its author, Nikhil Mungel.

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