using alias in shell script? [duplicate]

Question

My alias defined in a sample shell script is not working. And I am new to Linux Shell Scripting. Below is the sample shell file

#!/bin/sh  echo "Setting Sample aliases ..." alias xyz="cd /home/usr/src/xyz" echo "Setting done ..." 

On executing this script, I can see the echo messages. But if I execute the alias command, I see the below error

xyz: command not found 

am I missing something ?

Answer 1

source your script, don't execute it like ./foo.sh or sh foo.sh

If you execute your script like that, it is running in sub-shell, not your current.

source foo.sh   

would work for you.

Answer 2

You need to set a specific option to do so, expand_aliases:

 shopt -s expand_aliases 

Exemple:

# With option $ cat a #!/bin/bash shopt -s expand_aliases alias a="echo b" type a a $ ./a a is aliased to 'echo b' b  # Without option $ cat a #!/bin/bash alias a="echo b" type a a  $ ./a ./a: line 3: type: a: not found ./a: line 4: a: command not found 

cf: https://unix.stackexchange.com/a/1498/27031 and https://askubuntu.com/a/98786/127746