DZone Snippets: ksh code

add a folder to PATH, but not if it is already in PATH

jmcvetta (Jason McVetta) — Wed, 28 Nov 2007 18:38:16 GMT

Often times one uses a single .profile or .bashrc across several hosts. These hosts may be differently configured, with varying directory locations, and different initial PATH values from /etc/profile. In situations like this, setting PATH the traditional way -- "PATH=$PATH:/path/to/some/stuff" -- can result in a cumbersomely long PATH that includes inaccessible or duplicate folders.

The snippet below nicely handles this problem. It has been tested on Solaris and Linux.



AddPath ()

# Add argument to $PATH if:

# - it is not already present

# - it is a directory

# - we have execute permission on it

#

# This snippet is public domain; you may use it freely.  Death to copyright, patents, 

# and all other forms of intellectual monopoly.  

#

{

  _folder=$1

  echo " $PATH " | sed 's/:/ /g' | grep " $_folder " > /dev/null

  [ $? -ne 0 ] && [ -d $_folder ] && [ -x $_folder ] && PATH=$PATH:$_folder

  export PATH

}



# Add some common paths:

AddPath /usr/bin

AddPath /usr/local/bin

AddPath /opt/somepackage/bin

bash aliases

mikewilsonuk (Mike Wilson) — Sat, 06 May 2006 02:31:38 GMT

For old duffers like me who were used to earlier shells when bash came along.



# These save typing, I use them a lot



alias sd='cd -' > /dev/null

alias cx='chmod +x'

alias which="type -path"



# This goes back to Unix v7, some time around 1985 I think.



alias lf='ls -CF'



# From my 'C' shell days. Those were almost 20 years ago as well. Sigh.



alias h='fc -l -20'

alias r='fc -s'



# Because real men use 'vi' and why use character mode if you have X?



alias vi='gvim'

.inputrc to make bash command-line editing like ksh

mikewilsonuk (Mike Wilson) — Sat, 06 May 2006 02:26:24 GMT

I was used to ksh and vi when bash came along, so I wanted the behaviour to remain the same. Some may think this odd.



set editing-mode vi

set keymap vi

Basename in ksh without using /usr/bin/basename

jones77 (James Jones) — Tue, 18 Oct 2005 23:53:57 GMT

Faster than $( basename ) or `basename`
BASENAME=${0##*/}