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while read line; do
echo ${line%????}
done < infile

---------- Post updated at 22:39 ---------- Previous update was at 22:31 ----------

awk '{sub(/....$/,"")}1' infile

---------- Post...

or AWK
awk '{print substr($0,(length($0)-3))}' FILE

bash

while read -r line
do
echo ${line:(-4)}
done < "file"

You want to remove the last four characters or keep them?

You say remove them, then say:


Remove
sed "s/....$//" file1
iwishicouldremove
icouldremove


Keep

sed "s/.*\(....$\)/\1/"...

Unix keeps 3 timestamps for each file: mtime, ctime, and atime. Most people seem to understand atime (access time), it is when the file was last read. There does seem to be some confusion between...