How to remove the last character.

[iamlinux]

Hi iam a new user in this forum and Linux.
I have a string like this "/home/test/filename.txt"
and i want to delete all character after the last "/".
how to do that using sed or awk.
sorry my english is bad.

[tpl]

welcome to the forum

if your input is called A, then something like this might work:

tr / \\n <A | sed '$d' | tr \\n / >B

[iamlinux]

Thanks for answer, its work
Can you explain that

[drl]

Hi.

Using built-ins in shell bash allows one to avoid external programs:

#!/usr/bin/env bash

# @(#) s1	Demonstrate bash in-built syntax for string manipulation.

echo
t1="/home/test/filename.txt"
echo " Original: $t1"

echo
echo " Modified: ${t1%/*}/"

exit 0

producing:

% ./s1

 Original: /home/test/filename.txt

 Modified: /home/test/

See topic Parameter Expansion in man bash for details ... cheers, drl

[egan]

Also, the dirname program does this for files specifically.

[iamlinux]

Thank you very much.

can anyone explain this
tr / \\n <A | sed '$d' | tr \\n / >B