Replace string value using SED command

Question

my command is

sh abc.sh 'hello'

Inside my shell script abc.sh

var1=$1
sed -i "s/'/ /g" $var1

but sed is not working

`$var1` is interpreted as the input file name, not the string to process. — choroba, Feb 12 '21 at 09:52
What's wrong with simply `echo $1` if all you want to do is remove the single quotes? — David C. Rankin, Feb 12 '21 at 10:38

apapillon · Answer 1 · 2021-02-26T13:17:53.373

0

sed wait filename in argument (see man sed)

sed [OPTION] .... {script-only-if-no-other-script} [input-file]

Into your script, you need to change to:

echo "$var1" | sed "s/'/ /g"

edited Feb 26 '21 at 13:17

answered Feb 12 '21 at 10:00

apapillon

1

You also need to [quote the variable](https://stackoverflow.com/questions/10067266/when-to-wrap-quotes-around-a-shell-variable). – tripleee Feb 12 '21 at 12:55

score 0 · Answer 2 · answered Feb 12 '21 at 10:13

You are performing sed on a variable and not a file and so redirect the variable back into sed to get the desired result:

sed "s/'//g" <<< "$var1"

This avoids the inefficiencies associated with echo "$var1" | sed .....

An alternative to sed in this use case is tr and so:

tr -d "'" <<< "$var1"

Use -d "'" to pass the character you want to delete from the text.

2 Answers2