Replace string in linux bash

Question

I am writing a bash script for installing django with postgresql database automatically. Now , I want to replace database name by command ,since it is using sqlite3 database file path.

I wrote this command:

sudo sed -i 's/os.path.join(BASE_DIR, 'db.sqlite3'),/'$project_name',/g' $projects_name/settings.py

But this is not changed while I am making the django project.

How to change this , please help me.

`$project_name` and `$projects_name` are different variables? — Inian, Sep 14 '16 at 06:01

Inian · Accepted Answer · 2016-09-14T08:22:13.097

2

Use double-quotes around sed for variable expansion & to preserve single quotes.

sed -i "s/os.path.join(BASE_DIR, 'db.sqlite3'),/$project_name,/g" "$project_name/settings.py"

tested working fine on GNU sed version 4.2.1

edited Sep 14 '16 at 08:22

answered Sep 14 '16 at 06:10

Inian

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Thanks, it is working. – HM Tanbir Sep 14 '16 at 06:32
@Engr.TanbirHasan: Happy to help! – Inian Sep 14 '16 at 06:34
It works as double quotes around the sed command preserve single quotes in `'db.sqlite3'`. But please note that variable expansion is not the issue here. – SLePort Sep 14 '16 at 08:08
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@Kenavoz: totally agree to it! Added a note for the same. – Inian Sep 14 '16 at 08:22

SLePort · Answer 2 · 2016-09-14T08:04:34.820

1

You should escape the quotes in 'db.sqlite3':

sudo sed -i 's/os\.path\.join(BASE_DIR, '\''db\.sqlite3'\''),/'$project_name',/g' $projects_name/settings.py

Your sed pattern is os.path.join(BASE_DIR, db.sqlite3), because quotes in 'db.sqlite3' are not interpreted as literal '. Instead they close and reopen the sed command.

edited Sep 14 '16 at 08:04

answered Sep 14 '16 at 06:10

SLePort

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Replace string in linux bash

2 Answers2