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grep -v -E '^$|^--' yourfile.txt > /tmp/output.txt

try this command:
last

Using pointer,any programming language can do this.
But it's dangerous if you do the job incorrectly,it's possible to damage data.

First to find out the line you want to replace,then build new...

awk -F: '{if($3>=10 && $3<=15) {print $0}}' /etc/passwd

[aix:~ ]$echo $SHELL
/bin/bash
[aix:~ ]$date -d "-1 days ago" +"%Y%m%d"
20120112
[aix:~ ]$date
Wed Jan 11 16:42:33 BEIST 2012

Set PATH variable including the directory where your shell scripts locate in.
Or execute it using absolute path.

Firewall refuse ping?