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Alias has no effect in script

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# 1  
Old 12-22-2012
Alias has no effect in script
It doesn't have effect in script but it works on the terminal
Code:
root@server:/opt/kvm/usecases/logs# alias echo='echo -e'
root@server:/opt/kvm/usecases/logs# echo "xxxx\n"
xxxx
root@server:/opt/kvm/usecases/logs# cat xx.sh
#!/bin/bash
alias echo='echo -n'
echo  "sssf \n"

root@server:/opt/kvm/usecases/logs# ./xx.sh 
sssf \n




Code:



alias ssh='ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no'






also has no effect in script

# 2  
Old 12-22-2012
echo is a shell builtin and a UNIX command in /usr/bin. The command version in /usr/bin accepts -e

So:

Code:
alias echo='/usr/bin/echo -e'

You are better off off specifying which echo:
Code:
/usr/bin/echo -e "sssf \n"

is you best choice
# 3  
Old 12-22-2012
Quote:
Originally Posted by jim mcnamara
echo is a shell builtin and a UNIX command in /usr/bin. The command version in /usr/bin accepts -e

So:

Code:
alias echo='/usr/bin/echo -e'

You are better off off specifying which echo:
Code:
/usr/bin/echo -e "sssf \n"

is you best choice
also has no effect

Code:
root@server:/opt/kvm/usecases/logs# ./xx.sh
sssf \n
root@server:/opt/kvm/usecases/logs# cat xx.sh
#!/bin/bash
alias echo='/bin/echo -e'
echo  "sssf \n"
root@server:/opt/kvm/usecases/logs# which echo 
/bin/echo

# 4  
Old 12-22-2012
You can fix this by adding shopt -s expand_aliases
Code:
#!/bin/bash
shopt -s expand_aliases
alias echo='echo -e'
echo  "sssf \n"

Note: aliases are not expanded by default in non-interactive shell, and it can be enabled by setting the expand_aliases shell option using shopt.
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