linux shell 脚本攻略学习19--sed命令详解

amosli@amosli-pc:~/learn/sed$ 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 extension supplied)
-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 exitIf 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.

sed [OPTION]... {script-only-if-no-other-script} [input-file]...

amosli@amosli-pc:~/learn/sed$ cat test.txt
hi,this is sed command test file
linux world is so amazingyou will like it!

sed 's/pattern/replace_string' file
#或者
cat file | sed 's/pattern/replace_string' file

amosli@amosli-pc:~/learn/sed$ sed "s/will/WILL/" test.txt
hi,this is sed command test file
linux world is so amazingyou WILL like it!

amosli@amosli-pc:~/learn/sed$ echo "this is test" | sed "s/test/TEST/"
this is TEST

amosli@amosli-pc:~/learn/sed$ sed -i 's/like/LOVE/' test.txt
amosli@amosli-pc:~/learn/sed$ cat test.txt
hi,this is sed command test file
linux world is so amazingyou will LOVE it!

-i[SUFFIX], --in-place[=SUFFIX]
edit files in place (makes backup if extension supplied)

amosli@amosli-pc:~/learn/sed$ echo "test1 test2 test3 test4 " | sed "s/test/TEST/g"
TEST1 TEST2 TEST3 TEST4

amosli@amosli-pc:~/learn/sed$ echo "test1 test2 test3 test4 " | sed "s/test/TEST/3g"
test1 test2 TEST3 TEST4

amosli@amosli-pc:~/learn/sed$ echo "test1 test2 test3 test4 " | sed "s:test:TEST:g"
TEST1 TEST2 TEST3 TEST4
amosli@amosli-pc:~/learn/sed$ echo "test1 test2 test3 test4 " | sed "s|test|TEST|g"
TEST1 TEST2 TEST3 TEST4

amosli@amosli-pc:~/learn/sed$ echo "te/st1 te/st2 te/st3 te/st4 " | sed "s/test/TEST/g"
te/st1 te/st2 te/st3 te/st4

amosli@amosli-pc:~/learn/sed$ echo "te/st1 te/st2 te/st3 te/st4 " | sed "s/te\/st/TEST/g"
TEST1 TEST2 TEST3 TEST4

amosli@amosli-pc:~/learn/sed$ sed '/^$/d' test.txt
hi,this is sed command test file
linux world is so amazing
you will LOVE it!

amosli@amosli-pc:~/learn/sed$ echo this is a test | sed 's/\w\+/[&]/g'
[this] [is] [a] [test]

amosli@amosli-pc:~/learn/sed$ echo this is digit in a number | sed 's/digit \([0-9]\)/\1/'
this is in a number

amosli@amosli-pc:~/learn/sed$ cat test.txt
hi,this is sed command test file
linux world is so amazingyou will LOVE it!
amosli@amosli-pc:~/learn/sed$ cat test.txt | sed 's/linux/LINUX/' | sed 's/sed/SED/'
hi,this is SED command test file
LINUX world is so amazingyou will LOVE it!

amosli@amosli-pc:~/learn/sed$ cat test.txt | sed "s/linux/LINUX/; s/sed/SED/"
hi,this is SED command test file
LINUX world is so amazingyou will LOVE it!

sed 'expression' | sed 'expression'
#or
sed 'expression;expression'

amosli@amosli-pc:~/learn/sed$ txt=hello

amosli@amosli-pc:~/learn/sed$ echo "hello world" | sed "s/$txt/HELLO/g"
HELLO world

选项 功能
-e 进行多项编辑，即对输入行应用多条sed命令时使用
-n 取消默认的输出
-f 指定sed脚本的文件名