Bash

manual, refs

• Mendel Cooper - Advanced Bash-Scripting Guide (aka. ABS) (한글판)
• Bash Reference Manual
• bash features
• BASH Programming - Introduction HOW-TO ★
• Bash Guide for Beginners
• Bash scripting Tutorial

bash expansion : ranges

$ echo {d..h}
d e f g h

$ echo {d..Z}
d c b a _ ^ ]  [ Z

For more information, refer wiki.bash-hackers.org.

redirection

### cp file1 file2와 같다
$ cat < file1 > file2

nice

Usage: nice [OPTION] [COMMAND [ARG]...]
Run COMMAND with an adjusted niceness, which affects process scheduling.
With no COMMAND, print the current niceness.  Niceness values range from
-20 (most favorable to the process) to 19 (least favorable to the process).

string : $''

$ # Single quotation in single qoute
$ # http://stackoverflow.com/a/16605140/766330
$ echo \'sdlfkjsldf\' | sed $'s/\'//'
sdlfkjsldf'
$ #   $'string' : this is special.
$ #   below line won't work.
$ #   echo \'sdlfkjsldf\' | sed 's/\'//‘

[1]

or

$ # 'or' 
$ if [ -z "$1" ] || [ -z "$2" ]; then
>    echo "Usage: `basename $0` rslt_file target_folder"
> fi

ref. expressions used with if