Linux Shell script what dirname and ? means?

user_1583549 0
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Can any body tell me what this command means?

selfDir=$(cd "$(dirname "$0")"; pwd) ?

I know

  • $0 = running script name
  • pwd = current working dir
  • cd = to change dir

What I need is what is dirname? and what ? means at end to make this line completely understandable.

unix linux bash
1 Answers

The dirname command removes the trailing / component from the NAME and prints the remaining portion. If the NAME does not contain / component then it prints '.' (means current directory)

Dirname Command Example:

Remove the file name from absolute path.

Let say my directory path is /usr/local/bin/add.sh. Now i want to remove /add.sh and display only /usr/local/bin, then we can use the dirname command.

dirname /usr/local/bin/add.sh
/usr/local/bin

NAME

dirname - strip non-directory suffix from file name

SYNOPSIS

dirname NAME 
dirname OPTION

DESCRIPTION

Print NAME with its trailing /component removed; if NAME contains no /’s, output ‘.’ (meaning the current directory).

Edit: Also, Some characters have special functions in linux commands ? <-- Matches one character

Source

user_18845490
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