shell: replacing string in a file using sed

Question

I am writing a script to replace a string in a file in linux.

this is my code:

echo "Enter file name? "
read FILE1
echo "You have entered, $FILE1"

echo "String to be replaced "
read STR1
echo "You have entered, $STR1"

echo "Replace by "
read STR2
echo "You have entered, $STR2"

sed -i 's/$STR1/$STR2/g' /misc/home3/abc/$FILE1

echo "DONE !!"

The string is not getting replace in the file. what could be wrong with it??

Thanks :)

Variables aren't parsed in single quotes; use double quotes; ie. "s/$str1/$str2/g" — Martin Tournoij
– Martin Tournoij, Commented Jul 30, 2014 at 9:37

Aaron Digulla · Accepted Answer · 2014-07-30 09:38:34Z

1

Do not use ' for the sed-string but " like this:

sed -i "s/$STR1/$STR2/g" /misc/home3/abc/$FILE1

Double quotes allow the shell to do variable expansion inside of the quoted text. Single tick ' prevents this.

edited Jul 30, 2014 at 9:38

Aaron Digulla

330k111 gold badges626 silver badges840 bronze badges

answered Jul 30, 2014 at 9:38

Patrick B.

12.6k9 gold badges64 silver badges108 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

shell: replacing string in a file using sed

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related