Unix tip: Useful Unix aliases
Unix aliases provide an easy way to customize your working environment. Let's look at some especially useful aliases that you might like.
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Aliases etc.
Thanks - there were some useful aliases in your latest article. You might like this function, which I find very useful when looking for permission errors:lsdup() {
here=$(pwd)
while true
do
print "$(ls -ld) $PWD"
cd ..
[ $PWD = "/" ] && break
done
cd $here
}
moving to previous directory
To go back to the previous directory I just use "cd -". No special alias is required. But what if you're working amongst three directories? What's a good way to quickly set up shortcuts which allow to bounce between them?aliases
You may not want to aliase rm -i as rm, especially if you use rm to remove files, etc using a script in cron, using the next choice would be better.grep through code
Here's one I like to use, this one for Python applications, but easy to set up for other languages as well:alias greppy="find . | grep -v [.]svn | grep -v bundle | grep [.]py$ | xargs grep "Beginning with the current directory, look for all of the Python files that are not part of subversion, not part of a bundle, skipping those that are like .py~ and .pyc, and pass those to grep.
Use of alias for rm -1
Regarding the comment on not aliasing rm to 'rm -i' due to its effect in scripts:An alias shouldn't make any difference in scripts, as scripts should have hard paths for commands.
Scripts should contain something like this:
RM=/bin/rm
LS=/bin/ls
...
rm is then called in the script as $RM
There are at least 2 reasons for doing so:
* Your script will always run /bin/rm, not some script or executable named 'rm' that appears somewhere in your PATH
This is the same reason you probably don't want ./ in your path
* The PATH value becomes irrelevant to the running of frequently used commands in the script.
Personally, I use a function hardpath() that determines the location of each executable within a predetermined set of directories, and sets the requisite variable to that location. The script fails if a required executable is not found in the path set.
CD between 3 directories quickly
THE CODE:cdA()
{
A_old_dir=$PWD
[ ! -z $* ] && A_new_dir=$*
cd $A_new_dir
}
cdB()
{
B_old_dir=$PWD
[ ! -z $* ] && B_new_dir=$*
cd $B_new_dir
}
cdC()
{
C_old_dir=$PWD
[ ! -z $* ] && C_new_dir=$*
cd $C_new_dir
}
alias ,a=cdA
alias ,b=cdB
alias ,c=cdC
# I use a comma as a shortcut to 'cd'
# Both begin with a comma.
# Now ,a is easier than cdA
# Your choice, name them anything.
# try these
,a /usr/local/bin # puts you in specified directory
,b /var/adm
,c /usr/bin
# now use just the alias (no directory)
,a # puts you in /usr/local/bin
,c # puts you in /var/adm
,c # puts you in /usr/bin
# and my two favorite cd-related shortcuts
alias ,=cd # cd to a directory
alias ,,='cd -' # cd back to the previous directory
# I picked parts of these up over the years doing
# UNIX support. I've tweaked them and made them
# do what I've needed. Have fun.
typos - CD between 3 directories quickly
I meant to say that 'cd' and comma both begin with a 'c', that's how I remember it.Also, in the 'now use just the alias' section, the second one should be ,b (not ,c).
Ciao
Unix alias
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