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Parameter substitution with alias

 
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# 1  
Old 05-12-2009
Parameter substitution with alias
Hello,

in my .bashrc I tried to setup some aliases.
Code:
alias scp_cmd="scp -P 8888 $1 me@somehost:."

is supposed to copy a local file to somehost via scp. However it seems that the command line substitution does not work here. However this works:
Code:
alias lst="ls -l $1"

The above scp command can be handled like this which works for me:
Code:
scp_cmd() { scp -P 8888 $1 me@somehost:. ; }

I tried this on bash version:
GNU bash, version 3.2.39(1)-release (i386-redhat-linux-gnu)

I am curious why the first alias version doesn't work although the lst command seems to work well.
Thank you.

Best regards
Stephan
# 2  
Old 05-13-2009
aliases don't know about parameters. It's that simple. However, if you include a variable in an alias, it will expand it at the time of definition. So if $1 happens to expand to something (usually blank) that's what you will get when you invoke the alias.
 
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