CODEWITHSUNDEEP
regexbashsedterminal
Geesh_SO
Geesh_SO

Reputation: 2206

How exactly does this Sed command work?

sed 's@.*/.*\.@.@'

The command is part of a larger command to find all file extensions in a directory.

find . -type f -name '*.*' | sed 's@.*/.*\.@.@' | sort | uniq

I understand that find returns all files with an extension, I understand that sed returns just the extensions and then sort/uniq are self-explanatory.

At first, I was confused about the @ symbol, but my best guess now guess is that it is part of Regex.

What really confuses me is a can't figure how it explicitly works, and the closest matching syntax I can find in a manual is s/regexp/new/ which still doesn't match the syntax of the command.

Upvotes: 1

Views: 114

Answers (1)

C. K. Young
C. K. Young

Reputation: 223043

In the s/regexp/replacement/ syntax, the / can be replaced by any other character, such as ,, :, @, etc. This is very useful if your regexp itself contains / characters, such as your example of .*/.*\..

Your command could be simplified a bit, though:

find . -type f -name '*.*' | sed 's/.*\././' | sort -u

Here, I simplified the regexp so that it no longer contains a / character.

Upvotes: 4

Related Questions