sed command to delete a string containing / ,\ characters

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Mike

I have a String

/abc/gef        \*(cse,fff)

to delete from a file,have to match the full string pattern,tried with

sed -i '//abc/gef        \*(cse,fff)/d' filename

but this ends in an error:

sed: -e expression #1, char xx: expected newer version of sed

I also tried the following options but didn't work:

sed -i '/\/abc\/gef        \*(cse,fff)/d' filename
sed -i 's|/abc/gef        \*(cse,fff)||g' filename

What is the right command for this?

terdon

The problem is that both \ (escape character) and * (0 or more) have a special meaning in regular expressions, so you need to escape them in order to use them as literal characters. Now, the way to escape something is to add a \ before it. So, in order for * to match a literal asterisk and not mean "0 or more", you would write \*. Similarly, to escape the \ you would write \\. Putting this together, we have:

$ cat file 
foo
bar
/abc/gef        \*(cse,fff)
baz

And:

$ sed '/\/abc\/gef        \\\*(cse,fff)/d' file 
foo
bar
baz

Note how I have also escaped the / since // is the match operator in sed. This is why we have /\/abc\/gef and not //abc/gef. The d at the end means "delete any line matching this pattern".

Collected from the Internet

Please contact [email protected] to delete if infringement.

edited at2021-07-26

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