Bash删除所有以空格开头的行

Question

I'm trying to delete a few lines from fstab using sed or awk, i want to delete those lines that are starting with some prefix, those lines might have whites spaces.

I've tried this option: sed -i '/^SomeFileSystem/d' fstab but it's not deleting the line..

fstab entry:

myServer:/clearcase /clearcase nfs rw,hard,intr,bg,tcp,vers=3,rsize=32768,wsize=32768,timeo=4

This is the command that I'm trying to execute

sed -i '/^myServer:/clearcase/d' fstab

Answer 1

This is probably not working because of the slash / in the string you are looking for.

Just use another sed separator:

sed -i '\@^myServer:/clearcase@d' fstab

Answer 2

Escape the slash inside:

myServer:/clearcase /clearcase nfs rw,hard,intr,bg,tcp,vers=3,rsize=32768,wsize=32768,timeo=4

Try this:

sed -i '/^myServer:\/clearcase/d' fstab

Answer 3

If the line may start with whitespace, adapt your regex to say so.

sed -i '\#^ *myserver:/clearcase#d' fstab

This also avoids the requirement to escape the slash by using a different regex delimiter than slash.