Shell Command: sed.For replace string.

sed : for replace string.

Ref: https://github.com/lqwangxg/script/wiki/Script-Introduction

Example1.
 From xml find between <xml:user-modules> and </xml:user-modules> 
 delete this xml snippet

sed -e '/\<xml:user-modules>/,/\/xml:user-modules\>/ d' test.xml >result.xml

Example2.
 From xml find between <xml:user-modules> and </xml:user-modules> 
 replace user: to customer

sed -e '/\<xml:user-modules>/,/\/xml:user-modules\>/ s/user/customer/g' test.xml >result.xml

$ 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

  --follow-symlinks

                 follow symlinks when processing in place

  -i[SUFFIX], --in-place[=SUFFIX]

                 edit files in place (makes backup if SUFFIX supplied)

  -l N, --line-length=N

                 specify the desired line-wrap length for the `l' command

  --posix

                 disable all GNU extensions.

  -E, -r, --regexp-extended

                 use extended regular expressions in the script

                 (for portability use POSIX -E).

  -s, --separate

                 consider files as separate rather than as a single,

                 continuous long stream.

      --sandbox

                 operate in sandbox mode.

  -u, --unbuffered

                 load minimal amounts of data from the input files and flush

                 the output buffers more often

  -z, --null-data

                 separate lines by NUL characters

      --help     display this help and exit

      --version  output version information and exit

If no -e, --expression, -f, or --file option is given, then the first

non-option argument is taken as the sed script to interpret.  All

remaining arguments are names of input files; if no input files are

specified, then the standard input is read.

========================================

Examples Of Using:

$ cat data1
0000
0001
0002
0003
0004

$ sed -e /0$/i\#Comment data1  #-e script:start from line0 to $end, -i:before match line

#Comment
0000
0001
0002
0003
0004

$ sed -e /3$/a\xyz data1  #-e script:start from line3 to $end, -a:after match line

0000
0001
0002
0003

xyz
0004

$ sed -e /[1-3]/axyz data1  #-e script:start from line1 to 3, -a:after match line

0000
0001

xyz
0002

xyz
0003

xyz
0004

$cat text.txt
DAT00000000

DAT00000001

$ sed -ie '/^$/d'  text.txt  #-e:script, -d:delete, /^$/empty line. -i:before match line

DAT00000000
DAT00000001

$ cat text.txt | sed -e '/DAT//g'  #-e:script, -g:global, /pattern/replace/

00000000
00000001

$ cat text.txt | sed -e 's/DAT/DT/g'  #-e:script, -s:single, -g:global, /pattern/replace/

DT00000000
DT00000001