=== sed ===
sed can be used to substitute
\\
eg. substitute : with nothing, and do for every occurrence (represented by g)
<sxh bash>
sed 's/://g'
</sxh>
\\
<sxh bash>
s/X/Y/
replaces X with Y
/ represents nothing
g represents every occurance
</sxh>
\\
\\
=== remove multiple characters from line ===
Below removed [ and ]
<sxh bash>
sed 's/[][]//g'
</sxh>
below removes , 7 and l
<sxh bash>
sed 's/[,7l]//g'
</sxh>
\\
\\
=== remove anything before a character ===
<sxh bash>
sed 's/.*[/]//'
</sxh>
For example, if you are trying to get the log format for apache (centos):
<sxh bash>
grep ^ErrorLog /etc/httpd/conf/httpd.conf | awk '{print $2}' | sed 's/.*[/]//'
</sxh>
Returns
<sxh bash>
error_log
</sxh>
Sometimes format is error.log