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I just wants to modify a bash shell command like exit so when i write exit in the terminal it clears the screen, and echo some text, wait 2 seconds, then execute the exit function.
So is there any way to modify a shell command on Ubuntu, if there is away how ?

Black Block
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3 Answers3

4

You can use a shell alias

alias exit='clear; sleep 2; exit'

To make it permanent, add the alias to the bottom of the ~/.bashrc file. see this thread for help

Community
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steeldriver
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I have found a workaround instead of editing the exit bash command,
trap 'clear; ~/ascii3.sh; spd-say "Exit"; sleep 2' EXIT by using a trap to the exit in the terminal and i put it in the end of the .pashrc file and it works.
And the ascii3.sh:

echo -e "\033[01;31m"
echo " _  _   __   _  _  ____     __     __ _  __  ___  ____    ____   __   _  _  _   "
echo "/ )( \ / _\ / )( \(  __)   / _\   (  ( \(  )/ __)(  __)  (    \ / _\ ( \/ )/ \  "
echo ") __ (/    \\\ \/ / ) _)   /    \  /    / )(( (__  ) _)    ) D (/    \ )  / \_/  "
echo "\_)(_/\_/\_/ \__/ (____)  \_/\_/  \_)__)(__)\___)(____)  (____/\_/\_/(__/  (_)  "

I think the question i asked was a very bad one as it didn't reflect my thoughts but i won't change it nor the answer i just put this answer here for anyone who want it.

Black Block
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0

You cannot easily modify a command, but you can replace a command. 

# You only need this one time:
mkdir --mode=755 $HOME/bin  

# You need this command once per login (or in $HOME/.bashrc)
PATH="$HOME/bin:$PATH"

Then any executable file/script in $HOME/bin will override any command with the same name.

When you type a command, the shell looks for an executable file by that name in each of the directories in $PATH.

Unfortunately, your example exit is a "Shell builtin" (see man bash) and is not sought along $PATH, rather it is handled by the shell internally. To override exit you will have to define a shell function or alias(see man bash) in your $HOME/.bashrc

waltinator
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