Re: path keeps bloating with repeated entries on invoking subshells
- From: Dan Espen <daneNO@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 30 Jul 2008 17:01:32 GMT
Rahul <nospam@xxxxxxxxxxxxxx> writes:
In my tcshell I used to follow the construct:
set path=(./ ~/bin/ ~/bin/foocmds [snip]........ $path)
I thought this was the right way to go since I only append to the
systemwide path settings without overwriting anything as a user.
But yesterday I got a "word too long error" and on investigation I find
that each time I invoke a subshell (say, I made a change to the .cshrc or
added a new script to the bin) I find that the path keeps bloating up with
duplicate entries (I guess a side-effect of appending the $path at the
end).
Is there a smart-way around this?
Yes.
Loop thru the PATH looking for duplicates and remove the dupes.
Here's the logic in ksh:
#!/bin/ksh
# Modification History:
# Changed on 12/08/98 by Dan Espen:
# - New logic using "case" is faster, and fixes PATH,
# LD_LIBRARY_PATH, FPATH and MANPATH.
# Now fix the path by looking thru it for directories that don't exist,
# And duplicates:
pathfix(){
# Declare local variables
typeset pathin
typeset pathout
typeset anentry
typeset AllCriteria
typeset aCriteria
typeset flag
typeset holdme
typeset save_IFS
# save and set the IFS
save_IFS=$IFS
IFS=":${IFS}"
#
case $# in
1) AllCriteria="! -z -d" ; pathin=$1 ;;
2) AllCriteria=$1 ; pathin=$2 ;;
*) cat <<-! >&2
Usage: pathfix "tests" "path"
Example: PATH=$(pathfix "! -z -d" "$PATH")
will trim out all duplicate entries from the PATH, and will also
reject entries that are not directories '-d' and ones that are blank
Alt Usage: pathfix "path"
Example: PATH=$(pathfix "$PATH")
tests default to "! -z -d"
!
exit 2
;;
esac
#
# Loop through each entry in the pathin
#
for anentry in $pathin ; do
if [ "$anentry" != "" ]; then
flag=""
# Test agenst all of the AllCriteria
for aCriteria in $AllCriteria ; do
case $aCriteria in
!) holdme=$aCriteria ;;
*) if [ $holdme $aCriteria $anentry ]; then
:
else
flag="$holdme $aCriteria $anentry"
fi
holdme=""
;;
esac
done
# check for duplicate
case "${flag:+t}" in
"") case ":${pathout}:" in
*:${anentry}:*) ;;
*) pathout="${pathout}${pathout:+:}${anentry}" ;;
esac
;;
# t) ;; echo $0 $* --- $anentry --- flag=$flag
esac
fi
done
IFS="${save_IFS}"
echo $pathout
}
PATH=$(pathfix "! -z -d" "$PATH")
FPATH=$(pathfix "! -z -d" "$FPATH")
LD_LIBRARY_PATH=$(pathfix "! -z -d" "${LD_LIBRARY_PATH}")
MANPATH=$(pathfix "! -z -d" "$MANPATH")
export PATH FPATH MANPATH
.
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