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pushd and popd

 
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# 1  
Old 04-29-2010
pushd and popd
I'm learning about pushd and popd, and the section in my book defines them as functions to put in the .profile file, but I've noticed that the commands obviously already exist. I was wondering -- how do I find out where these commands are? Is there some kind other command/series of commands I can use to find out where these files are on my system?
# 2  
Old 04-29-2010
Hi.

pushd and popd are shell built-ins available in bash and csh and possibly other shells (but afaik, not ksh). It's unlikely that you will find these "files" anywhere on your system.

If they are not available in the shell you are using, you could simulate them using functions in your .profile as your book suggests.
Code:
man builtin
man pushd

# 3  
Old 05-10-2010
Okay, here are the two functions for pushd and popd:

Code:
DIRSTACK=""
export DIRSTACK
pushd ()
{ 
      dirname="$1"
      DIRSTACK="$dirname ${DIRSTACK:-$PWD' '}"
      cd ${dirname:?"missing directory name."}
      echo $DIRSTACK"

popd ()
{
     DIRSTACK=${DIRSTACK#* }
     cd ${DIRSTACK%% *}
     echo "$PWD"
}

When I try popd I get a message saying that the last directory pushed onto the stack I get message saying "No such file or directory," Even though I'm in that directory. I don't know what's going on. Can anyone help me?

The book is "learning the bash shell, third edition," if that helps.


Moderator's Comments:
Mod Comment Please use code tags!
Last edited by radoulov; 05-10-2010 at 06:19 PM..
# 4  
Old 05-10-2010
That implementation of pushd/popd definitely isn't going to work for directories with spaces. And adds directories to the stack even when the directory does not exist. And if you have them already, you don't need them in your profile at all. What shell are you using?
# 5  
Old 05-11-2010
I'm using the bash shell.
# 6  
Old 05-11-2010
You don't need them in your profile at all.
# 7  
Old 05-11-2010
In other words - you already have them - they are part of bash.
 
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