Home / ubuntu / Questions / 1147349
Accepted
brkroot
Asked: 2019-05-30 23:59:32 +0800 CST

Variable for absolute path and Alias for a command in one string or scrip?

  • 772

or in other words, how to cat files from a long path directory

cd /media/home/user/usb/Documents/Linux/test.txt
cat test.txt | grep abc

How do I shorten this?

I tried with a script:

#!/bin/bash

var1="/media/home/user/usb/locuments/linux/test.txt"
var2="cat test.txt | grep abc"

"cat test.txt"=`var1 var2"

or

"cat test.txt"=`cat test.txt | grep abc`

LOL ... Obviously don't have even a basic knowledge about scripting

There should be some other ways of doing this

What would be the best method to use for this to work?

what do I start to search and try for?

scripts command-line bash

1 Answers

  1. Best Answer

    If you always need to run that exact command, you can use an alias. Run nano ~/.bashrc and add this line to the file:

    alias abc='grep abc /media/home/user/usb/Documents/Linux/test.txt'

    Save the file, open a new terminal and you will now be able to just run abc and get your results.

    If you need to be able to search for different patterns, use a function instead. Again, run nano ~/.bashrc and add these lines (but delete the alias above if you have added it):

    function abc(){
    grep "$@" /media/home/user/usb/Documents/Linux/test.txt
}

    Save the file, close it, open a new terminal and you can now run:

    abc foo # search /media/home/user/usb/Documents/Linux/test.txt for 'foo'

    To search for the string foo in the file /media/home/user/usb/Documents/Linux/test.txt. Or 

    abc bar # search

    To search for the string bar, etc.

    • 1