Difference between revisions of "Positional parameters set"
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Following is an example of positional parameters created by command line arguments being later replaced by others. | |||
<pre> | <pre> | ||
#!/bin/bash | #!/bin/bash | ||
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echo '$3=' $3 | echo '$3=' $3 | ||
</pre> | </pre> | ||
The first <tt>echo</tt> statements will print the command line arguments; but the second set will print the first three files in the current directory! The <tt>set</tt> command replace the positional parameters with the output of <tt>ls</tt> command. | The first <tt>echo</tt> statements will print the command line arguments; but the second set will print the first three files in the current directory! The <tt>set</tt> command replace the positional parameters with the output of <tt>ls</tt> command. | ||
[[Category:Computing]] | [[Category:Computing]] | ||
Revision as of 12:24, 6 April 2006
Following is an example of positional parameters created by command line arguments being later replaced by others.
#!/bin/bash #try calling this with several arguments echo '$1=' $1 echo '$2=' $2 echo '$3=' $3 set `ls` echo '$1=' $1 echo '$2=' $2 echo '$3=' $3
The first echo statements will print the command line arguments; but the second set will print the first three files in the current directory! The set command replace the positional parameters with the output of ls command.
