Home / ubuntu / Questions / 402290
Accepted
user233233
Asked: 2014-01-09 07:42:50 +0800 CST

what this command do ? ls /usr/bin | grep ”man” | sed ”s/man/###/”?

  • 772

I have a question I want to know what this command do 

ls /usr/bin | grep ”man” | sed ”s/man/###/”

I have use this command and show me everything with ###, but I dont know whats mean. I hope someone can explain it.

command-line

1 Answers

  1. Best Answer

    ls /usr/bin

    • list the contents of /usr/bin and only show filenames.

    | grep ”man”

    • scan the output of the 1st part and search for "man". Result:

      ls /usr/bin | grep man
catman
dbmmanage
dh_installman
dh_installmanpages
man
mandb
manpath
mysqltestmanager
mysqltestmanagerc
mysqltestmanager-pwgen
pod2man
w3mman

    | sed ”s/man/###/”?

    • match pattern "man" and change it with "###". But this technically does nothing but echo the result. Example:

      $ cp /usr/bin/w3mman . 
$ ls |grep man 
w3mman 
$ ls |grep man|sed "s/man/###/" 
w3m### 
$wdamen@pluto:~$ ls w3* 
w3mman

      The file is still there and there is no file with "###"

    • 5