for loop not working in bash

Question

i have the below code to replace some strigns in multiple files, but the for loop is checking for the first file and not executing the perl script. below is my code

if [ -f zebu.work.post_opt/ZEBU_CTO_FT_MOD.v ]
then
    for file in $(./zebu.work.post_opt/ZEBU_CTO_FT_MOD*);
    do
    perl -i -p -e 's/input/inout/g' $file; 
        perl -i -p -e 's/output/inout/g' $file;
        perl -i -p -e 's/wire.*\n/tran\(i0,\ o\);/g' $file;
        perl -i -p -e 's/assign.*\n//g' $file;
    done
fi

Answer 1

The $(foo) construct will run the command foo and replace $(foo) with the output of running foo. You want a glob, that's not a command. What you're doing is attempting to run all files called ./zebu.work.post_opt/ZEBU_CTO_FT_MOD*. All you need is:

if [ -f zebu.work.post_opt/ZEBU_CTO_FT_MOD.v ]
then
    for file in ./zebu.work.post_opt/ZEBU_CTO_FT_MOD*;
    do
        perl -i -p -e 's/input/inout/g' "$file"
        perl -i -p -e 's/output/inout/g' "$file"
        perl -i -p -e 's/wire.*\n/tran\(i0,\ o\);/g' "$file"
        perl -i -p -e 's/assign.*\n//g' "$file"
    done
fi

Or, more simply:

if [ -f zebu.work.post_opt/ZEBU_CTO_FT_MOD.v ]
then
    for file in ./zebu.work.post_opt/ZEBU_CTO_FT_MOD*;
    do
        perl -i -p -e 's/input/inout/g; s/output/inout/g; 
                       s/wire.*\n/tran\(i0,\ o\);/g; 
                       s/assign.*\n//g' "$file"
    done
fi

Or even more simply:

if [ -f zebu.work.post_opt/ZEBU_CTO_FT_MOD.v ]
then
    perl -i -p -e 's/input/inout/g; s/output/inout/g; 
                   s/wire.*\n/tran\(i0,\ o\);/g; 
                   s/assign.*\n//g' ./zebu.work.post_opt/ZEBU_CTO_FT_MOD*
fi