Command passed as shell script argument

Question

I want to pass a command to a shell script. This command is a grep command. At runtime, I get the following errors, please help:

myscript.sh "egrep 'ERROR|FATAL' \*20100428\*.log | grep -v aString" 

myscript.sh is a simple script:

 #!/bin/ksh cd log $1 

errors:

 egrep: can't open | egrep: can't open grep egrep: can't open -v egrep: can't open aString 

The error is that egrap sees |, grep, -v and aString as arguments.

Answer 1

try the following:

 eval $1 

Answer 2

You can call sh -c $1 to call the first argument as commands in the new shell so that the special characters of the shell are extended.