运维分享｜Linux指令入门之文本查看（三）

grep --help
usage: grep [-abcdDEFGHhIiJLlMmnOopqRSsUVvwXxZz] [-A num] [-B num] [-C[num]]
	[-e pattern] [-f file] [--binary-files=value] [--color=when]
	[--context[=num]] [--directories=action] [--label] [--line-buffered]
	[--null] [pattern] [file ...]

Aion.Liu $ tail -50 package-lock.json | grep -C 1 "version"
          "version": "3.0.0",
          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
--
        "is-fullwidth-code-point": {
          "version": "2.0.0",
          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
--
        "string-width": {
          "version": "3.1.0",
          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
--
        "strip-ansi": {
          "version": "5.2.0",
          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
--
    "yargs-parser": {
      "version": "13.1.2",
      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
--
        "camelcase": {
          "version": "5.3.1",
          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",

sed --help

sed: illegal option -- -
usage: sed script [-Ealnru] [-i extension] [file ...]
	sed [-Ealnu] [-i extension] [-e script] ... [-f script_file] ... [file ...]

用法: sed [选项]... {脚本(如果没有其他脚本)} [输入文件]...
  -n, --quiet, --silent
                 取消自动打印模式空间
  -e 脚本, --expression=脚本
                 添加“脚本”到程序的运行列表
  -f 脚本文件, --file=脚本文件
                 添加“脚本文件”到程序的运行列表
  --follow-symlinks
                 直接修改文件时跟随软链接
  -i[SUFFIX], --in-place[=SUFFIX]
                 edit files in place (makes backup if SUFFIX supplied)
  -c, --copy
                 use copy instead of rename when shuffling files in -i mode
  -b, --binary
                 does nothing; for compatibility with WIN32/CYGWIN/MSDOS/EMX (
                 open files in binary mode (CR+LFs are not treated specially))
  -l N, --line-length=N
                 指定“l”命令的换行期望长度
  --posix
                 关闭所有 GNU 扩展
  -r, --regexp-extended
                 在脚本中使用扩展正则表达式
  -s, --separate
                 将输入文件视为各个独立的文件而不是一个长的连续输入
  -u, --unbuffered
                 从输入文件读取最少的数据，更频繁的刷新输出
  -z, --null-data
                 separate lines by NUL characters
  --help
                 display this help and exit
  --version
                 output version information and exit
如果没有 -e, --expression, -f 或 --file 选项，那么第一个非选项参数被视为
sed脚本。其他非选项参数被视为输入文件，如果没有输入文件，那么程序将从标准
输入读取数据。
GNU sed home page: <http://www.gnu.org/software/sed/>.
General help using GNU software: <http://www.gnu.org/gethelp/>.
E-mail bug reports to: <bug-sed@gnu.org>.
Be sure to include the word ``sed'' somewhere in the ``Subject:'' field.

[root@Aion test]# touch test.txt
[root@Aion test]# cat test.txt
[root@Aion test]#
[root@Aion test]# echo "1234" >> test.txt
[root@Aion test]# cat test.txt
1234
[root@Aion test]#
[root@Aion test]#
[root@Aion test]# sed '1aHello' test.txt
1234
Hello

awk --help
awk: unknown option --help ignored
awk: no program given

Usage: awk [POSIX or GNU style options] -f progfile [--] file ...
Usage: awk [POSIX or GNU style options] [--] 'program' file ...
POSIX options:  GNU long options: (standard)
	-f progfile  --file=progfile
	-F fs  	--field-separator=fs
	-v var=val  --assign=var=val
Short options:  GNU long options: (extensions)
	-b  	--characters-as-bytes
	-c  	--traditional
	-C  	--copyright
	-d[file]  --dump-variables[=file]
	-e 'program-text'	--source='program-text'
	-E file  	--exec=file
	-g  	--gen-pot
	-h  	--help
	-L [fatal]  --lint[=fatal]
	-n  	--non-decimal-data
	-N  	--use-lc-numeric
	-O  	--optimize
	-p[file]  --profile[=file]
	-P  	--posix
	-r  	--re-interval
	-S  	--sandbox
	-t  	--lint-old
	-V  	--version
To report bugs, see node `Bugs' in `gawk.info', which is
section `Reporting Problems and Bugs' in the printed version.
gawk is a pattern scanning and processing language.
By default it reads standard input and writes standard output.
Examples:
	gawk '{ sum += $1 }; END { print sum }' file
	gawk -F: '{ print $1 }' /etc/passwd