How to replace a text with ":" using sed

Question

I am trying to replace a text with the help of sed but I am really puzzled about in finding the reason for failure.

    Main file
    ===========
    user@shell>cat test
    new=21:58:22
    old=09:58:22

    echo $new
    echo $old

    user@shell>sed -i 's/$old/$new/g' yoo
    user@shell>
    user@shell>
    desired output
    ==============
    user@shell>cat yoo
    09:58:22
    09:58:22
    09:58:2209:58:22
    09:58:2209:58:22
    asdasd
    user@shell>

After this I was assuming that I will get the new values in file yoo but no changes are reflection.

use double quotes instead of single quotes. `sed -i "s/$old/$new/g" yoo` — Avinash Raj, Jan 14 '15 at 11:26

score 0 · Accepted Answer · answered Jan 14 '15 at 11:31

0

You need to expand the variables using double quotes like this,

sed -i "s/$old/$new/g" yoo

answered Jan 14 '15 at 11:31

Arnab Nandy

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How to replace a text with ":" using sed

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