cd to (or operate on) a file across parallel directories

cd ${PWD/a/b}
This is useful for quickly jumping around branches in a file system, or operating on a parellel file. This is tested in bash. cd to (substitute in PWD, a for b) where PWD is the bash environmental variable for the "working directory"
Sample Output
[root@centos manifests]# pwd
/etc/puppet/modules/nfs/manifests
[root@centos manifests]# cd ${PWD/nfs/packages}
[root@centos manifests]# pwd
/etc/puppet/modules/packages/manifests

.. or operate on a file in parallel directory
[root@centos manifests]# vi ${PWD/packages/nfs}/init.pp
[root@centos manifests]# cp -a ${PWD/packages/nfs}/init.pp .

7
By: greggster
2011-03-03 06:27:12

What Others Think

Thanks for posting this command. I'm sorry, but I can't understand what it does. Could you share some use cases?
wpiekutowski · 405 weeks and 4 days ago
I updated the comment for this. in bash - PWD is the working directory. To test - mkdir -p /tmp/a/b/cow/d mkdir -p /tmp/a/b/fish/d cd /tmp/a/b/cow/d; pwd where are you? cd ${PWD/cow/fish}; pwd where are you now?
greggster · 405 weeks and 4 days ago
Thanks! I didn't know about the ${PWD/cow/fish} substitution.
wpiekutowski · 405 weeks and 1 day ago
Thanks. One of the things I missed way back in the day when I switched from ksh to bash was the ksh "cd a b" which basically does what you show here. I wrote a function so bash does the same thing but this is handy.
splante · 401 weeks and 2 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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