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Alias not working


 
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# 1  
Old 01-19-2017
Bug Alias not working

I have several shell scripts which contain the nawk command.

Here is what i m doing assign the correct value to nawk as nawk is not found on a new systems.

Here is what i did.

more test.sh
Code:
[[ -x /usr/bin/gawk ]] && alias nawk=/usr/bin/gawk
[[ -x /usr/bin/nawk ]] && alias nawk=/usr/bin/nawk
[[ -x /usr/bin/awk ]] && alias nawk=/usr/bin/awk
nawk

Failed Output:
Code:
bash -x ./test.sh
+ source dr.profile
++ [[ -x /usr/bin/gawk ]]
++ alias awk=/usr/bin/gawk
++ [[ -x /usr/bin/nawk ]]
++ [[ -x /usr/bin/awk ]]
++ alias nawk=/usr/bin/awk
++ nawk
dr.profile: line 4: nawk: command not found

./test.sh: line 4: nawk: command not found

I was expecting nawk to become /usr/bin/awk
Can you suggest what is wrong ?
# 2  
Old 01-19-2017
Aliases usually do not work in noninteractive scripts, just terminal sessions.

Try sourcing it, rather than running it directly, . test.sh That will run it directly in your shell.
# 3  
Old 01-19-2017
RedHat

Sourcing works when in terminal but like i said i need nawk to be recognised automatically in all my scripts.

I tried these but both failed.

more test1.sh
Code:
. test.sh
nawk

Output:
Code:
./test1.sh
test.sh: line 4: nawk: command not found
./test1.sh: line 2: nawk: command not found

I also tried source test.sh instead of . test.sh but it also did not work.

What am i missing here ?

Last edited by mohtashims; 01-19-2017 at 03:10 PM..
# 4  
Old 01-19-2017
Aliases usually do not work in noninteractive scripts, just terminal sessions. You could turn it on, but then you'd want to be really really careful what other aliases you might have loaded from /etc/profile without realizing it.

For situations like this, I usually see a variable used, like $NAWK.

This also prevents the sort of recursions you've fought when using functions for this.
# 5  
Old 01-19-2017
Hammer & Screwdriver

Quote:
Originally Posted by Corona688
Aliases usually do not work in noninteractive scripts, just terminal sessions. You could turn it on, but then you'd want to be really really careful what other aliases you might have loaded from /etc/profile without realizing it.

For situations like this, I usually see a variable used, like $NAWK.

This also prevents the sort of recursions you've fought when using functions for this.
Are you suggesting this would work ?

Code:
[[ -x /usr/bin/gawk ]] && NAWK=/usr/bin/gawk 
[[ -x /usr/bin/nawk ]] && NAWK=/usr/bin/nawk 
[[ -x /usr/bin/awk ]] && NAWK=/usr/bin/awk
$NAWK

# 6  
Old 01-19-2017
Yes, exactly.
These 2 Users Gave Thanks to Corona688 For This Post:
# 7  
Old 01-20-2017
Alias works also in in noninteractive scripts.

Make own rc-file if not like add this to default rc-file:

$HOME/.xxrc file:
Code:
alias nawk='echo No nawk'
for awk in /usr/bin/gawk /usr/local/bin/gawk /usr/bin/nawk /usr/bin/awk
do
        [ -x "$awk" ] && alias nawk="$awk" && break
done
# test echo - you will see this test msg everytime when you start shell
echo "Myawk:$awk" >&2

Example add line to the $HOME/.bashrc:
Code:
[ -f $HOME/.xxrc ] && . $HOME/.xxrc

If you are ksh user then add same line to the $HOME/.kshrc or setup ENV
Code:
ENV=$HOME/.xxrc
export ENV

After those rc setup, always when you execute bash or ksh, shell will source .xxrc.
I'm sure that bash has also same method as ksh has ENV variable method to setup rc-file, but I didn't check it.

Code:
ls -al | nawk '{print $1}'


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