Delete lines starting with XX or YY or ZZ or ....

Shell Programming and Scripting
1

Hi There!

My final task for today is to delete lines starting with certain numbers

for e.g., my text block is

and i want to delete all lines starting with 11 or 17 or 21

I know i can use multiple sed commands like

sed '/^11,/d' <filename>
sed '/^17,/d' <filename>
sed '/^21,/d' <filename>

but is there any way of doing this in one sed command?

for e.g. sed '/[1]/d' <filename>

Thanks again!

  1. 11|17|21 ↩︎

2 
sed '/^1[17],/d;/^21,/d' filename
3

Or with grep:

egrep -v '^(1[17]|21),' filename