How to remove any string from a file via shell scripts?

Question

I try to remove string from .bash_profile. String is added when my shell script run:

My string at bash_profile as follows:

# for Myapllication
export MYAPP_HOME=/opt/myapp

I want to remove the strings from .bash_profile when myapp is removed via rpm.

How to remove any string from a file via shell script? (or possible alternative method)

Answer 1

You can remove a string from a text file with sed (other tools exist).

For example:

sed -i -e '/myapp/d' .bash_profile

removes from .bash_profile every line containing the string myapp.

Answer 2

A file like ~/.bash_profile lives in a home directory of a user. Such a file is completely under control of the user. Global acting commands like rpm are not supposed to change such files.

• You usually have a base configuration file, which is delivered by the rpm package.

• You then have a global configuration file which can be used by root to overwrite some preferences specific to the given system.

• Then you have personal configuration files in your home directory which you can use to override the global setting with your personal preferences.

A command like rpm should only change the first one and never change the latter.

Answer 3

sed -i '/^export MYAPP_HOME=\/opt\/myapp$/d' ~/.bash_profile

Answer 4

Try the vim-way:

ex -s +"g/MYAPP_HOME/d" -cwq file.txt