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Aliases NOT working inside bash shell script

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Top Forums Shell Programming and Scripting Aliases NOT working inside bash shell script
# 1  
Old 12-13-2016
Hammer & Screwdriver Aliases NOT working inside bash shell script
i have defined a function ln_s() for customizing the ln command in script1.sh.
Code:
more script1.sh
echo "Starting Execution"
./script2.sh
echo "End of Execution"
ln_s(){
  [[ -e $2 ]] && return
  ln -s "$1" "$2"
}

My script1.sh executes another script2.sh which has the following entry
Code:
more script2.sh
ln -s folder1 folder2

How can i automatically change all ln commands to ln_s so my custom function get called instead of the default ln command ?

I tried the adding the following inside the script1.sh but none of them work and it is picking ln command instead of ln_s

Code:
alias ln=ln_s
ln=ln_s
export ln=ln_s

Every time it calls ln instead of ln_s

Ref Thread: Ignore exit status for #!/bin/bash -e

Please suggest.
# 2  
Old 12-13-2016
A quick reference to man bash tells me
Quote:
Aliases are not expanded when the shell is not interactive, unless the expand_aliases shell option is set using shopt...
# 3  
Old 12-13-2016
Hammer & Screwdriver
Quote:
Originally Posted by RudiC
A quick reference to man bash tells me
I did put this line shopt -s expand_aliases; alias ln=ln_s in script1.sh but the output shows that that it is still picking ln instead of ln_s.
Output:
Code:
ln: cannot create folder2: File exists

Can you please explain why ?
# 4  
Old 12-13-2016
Works excellently for me:
without expand_aliases set:
Code:
./shscr: line 13: la: command not found


with expand_aliases set:
Code:
la .
+ ls -la .
total 176
drwxrw-r-- 6 user user 57344 Dez 13 14:35 .
.
.
.

Must be your setup / version?
# 5  
Old 12-13-2016
Hammer & Screwdriver
Quote:
Originally Posted by RudiC
Works excellently for me:
without expand_aliases set:
Code:
./shscr: line 13: la: command not found

with expand_aliases set:
Code:
la .
+ ls -la .
total 176
drwxrw-r-- 6 user user 57344 Dez 13 14:35 .
.
.
.

Must be your setup / version?
Please consider calling a second script i.e script2.sh from the first i.e script1.sh while having the command set in script2.sh while the alias set in script1.sh in your test.

Also find the details below.

Code:
bash-4.1$ bash --version
GNU bash, version 4.1.17(1)-release (sparc-sun-solaris2.11)
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
bash-4.1$ uname -a
SunOS mymac 5.11 11.2 sun4v sparc sun4v

Last edited by mohtashims; 12-13-2016 at 09:51 AM..
# 6  
Old 12-13-2016
Sorry? You NEED to set options and aliases in the script they are used in.
# 7  
Old 12-13-2016
Quote:
Originally Posted by RudiC
Sorry? You NEED to set options and aliases in the script they are used in.
I have no write permissions on script2.sh ... i just have ownership of script1.sh.

Can you please suggest ?
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