*:*:*:*:*:* Daniel's story *:*:*:*:*:*

sed -n '1p' filename

sed -n '$p' filename

sed -n '2p' filename

sed -n '1,3p' filename

sed '1,3d' filename

sed -n '/root/p' filename

sed -n ‘/love/,/peace/p’ datafile

sed '/^$d' 파일명 > 새파일명

sed 's/TEST/test/g' > 새파일명

sed 's/TEST//g' > 새파일명

# sed --help
Usage: sed [OPTION]... {script-only-if-no-other-script} [input-file]...

  -n, --quiet, --silent
                 suppress automatic printing of pattern space
  -e script, --expression=script
                 add the script to the commands to be executed
  -f script-file, --file=script-file
                 add the contents of script-file to the commands to be executed
  -i[SUFFIX], --in-place[=SUFFIX]
                 edit files in place (makes backup if extension supplied)
  -c, --copy
                 use copy instead of rename when shuffling files in -i mode
                 (avoids change of input file ownership)
  -l N, --line-length=N
                 specify the desired line-wrap length for the `l' command
  --posix
                 disable all GNU extensions.
  -r, --regexp-extended
                 use extended regular expressions in the script.
  -s, --separate
                 consider files as separate rather than as a single continuous
                 long stream.
  -u, --unbuffered
                 load minimal amounts of data from the input files and flush
                 the output buffers more often
      --help     display this help and exit
      --version  output version information and exit

#!/bin/bash
date= date +%Y-%m-%d_%H:%M:%S
echo $date

[root@localhost ~]# ./date.sh
2009-03-05_15:18:07

#!/bin/bash
today=`date +%Y%m%d`
echo $today

[root@localhost ~]# ./date2.sh
20090305

#!/bin/bash
A=1
while [ $A -lt 5 ]
do
        echo $A
        A=`expr $A + 1`
done

무한 루프문
#!/bin/bash
while [ : ]
do