统计/etc/init.d/functions文件中每个单词的出现次数，并排序（用grep和sed两种方法分别实现）
方法一：grep实现
grep -o "\<[[:alpha:]]\+\>" /etc/init.d/functions |sort |uniq -c
grep -o '[[:alpha:]]\+' /etc/init.d/functions | sort |uniq -c
[root@centos7 data]# grep -o "\<[[:alpha:]]\+\>" /etc/init.d/functions |sort |uniq -c
21 a
5 A
1 aA
1 abnormally
5 action
1 active
1 ActiveState
1 adjust
1 alive
2 all
1 already
2 and
1 And
3 any
1 anywhere
1 Apply
1 are
1 arg
2 at
1 avoid
7 awk
8 b
1 backup
2 bak
29 base
2 basename
2 bash
7 be
6 BEGIN
1 bg
13 bin
11 binary
1 bit
2 booleans
1 boot
21 BOOTUP
2 break
3 but
1 by
6 c
1 caller
3 can
8 case
1 cat
1 centi
2 cgexec
6 cgroup
1 Cgroups
4 check
2 Check
2 checkpid
1 cmdline
1 code
13 color
2 COLUMNS
3 command
1 condrestart
5 conf
2 configuration
1 confusing
1 consoletype
4 CONSOLETYPE
2 contains
9 continue
1 Convert
1 core
4 corelimit
1 could
1 current
27 d
5 daemon
1 daemons
3 dead
1 debug
1 deci
1 declared
1 default
11 delay
1 deleted
1 dependencies
1 details
17 dev
1 dies
1 directory
1 dirname
10 do
1 doc
1 doesn
10 done
2 due
1 dump
6 e
49 echo
1 Echo
3 eE
1 elif
9 else
5 en
1 END
5 eq
1 errors
8 esac
16 etc
2 Evaluate
1 exe
3 exists
4 exit
1 exited
1 export
1 expression
1 eyes
12 f
1 fail
1 failed
1 FAILED
7 failure
4 fF
51 fi
23 file
3 files
1 filter
2 find
1 Find
2 First
2 foo
12 for
5 force
2 found
1 from
1 fsck
4 function
2 functions
1 further
1 g
1 G
1 generated
1 Get
4 gotbase
1 graphical
3 grep
1 h
2 had
1 have
2 honor
5 i
60 if
1 ignore
1 IGNORECASE
1 ignored
25 in
1 including
1 Inform
6 init
1 initialize
2 initscripts
1 installed
2 insufficient
1 into
11 is
6 it
1 its
1 keyword
4 kill
1 Kill
1 KILL
8 killlevel
4 killproc
1 ksh
1 l
1 lang
1 let
1 lets
2 level
3 lib
7 line
1 little
1 lL
1 LoadState
37 local
1 locale
2 lock
1 locked
5 Log
1 LOGLEVEL
2 Look
1 looks
1 Looks
10 LSB
2 lt
3 m
1 make
1 Make
1 matching
1 may
1 micro
1 mili
1 most
38 n
1 nano
5 ne
7 nice
4 nicelevel
3 NICELEVEL
3 nN
1 NOLOCALE
6 not
14 null
13 o
7 of
2 OK
2 old
1 on
5 only
3 oO
2 option
3 options
3 or
2 orig
1 otherwise
2 our
1 out
1 output
1 Output
24 p
2 passed
1 PASSED
1 path
2 PATH
46 pid
11 pidfile
2 pidfileofproc
4 pidof
2 pidofproc
3 pids
1 PIDs
1 piko
1 plural
4 plymouth
5 PPID
7 printf
1 privilege
1 privileges
7 proc
1 processes
1 profile
8 prog
15 program
5 Program
1 propagating
3 q
8 r
11 rc
19 RC
2 read
1 Read
1 readlink
1 reality
1 recognizes
4 reload
2 Reloading
1 RemainAfterExit
4 remaining
1 Remove
1 requested
3 restart
1 Restarting
3 ret
54 return
1 returns
1 Returns
8 retval
1 rm
1 rpm
2 rpmnew
2 rpmorig
2 rpmsave
1 rR
1 RS
8 run
1 Run
8 running
1 runuser
12 s
1 S
1 same
2 sane
2 Save
3 sbin
1 screen
1 script
1 scripts
1 search
1 second
2 seconds
2 sed
2 See
1 seem
1 self
3 serial
6 service
3 set
2 Set
1 settings
1 sh
1 share
1 shell
1 Shell
18 shift
2 should
4 show
4 shutdown
2 shvar
2 signal
3 sleep
1 smhd
1 some
3 something
1 sourcing
1 specified
2 sS
3 start
1 Starting
2 startup
9 stat
1 state
6 status
3 stderr
4 stime
2 stop
1 stopped
1 Stopping
5 STRING
2 strstr
2 style
1 SubState
3 subsys
1 succeeded
5 success
2 sure
5 syntax
7 sysconfig
15 sysctl
1 system
11 systemctl
8 systemd
2 t
1 TERM
3 test
5 Test
1 TEXTDOMAIN
5 that
13 the
52 then
2 they
1 this
2 This
1 time
10 to
9 try
2 tT
1 txt
1 ulimit
2 umask
1 unit
1 unknown
1 unless
1 unset
2 up
1 update
9 Usage
1 use
3 used
1 Useful
9 user
1 using
5 usr
1 uU
2 v
1 value
7 var
6 verbose
4 via
3 warning
1 WARNING
1 We
1 where
1 whether
3 while
1 width
1 will
2 with
14 x
1 xcondrestart
1 xforce
1 xreload
1 xrestart
1 xstart
1 xstop
1 xtry
3 yes
2 yY
28 z
方法二：sed实现
下面命令，这样做，居然还会有空行~~~~
sed -n 's/[^[:alpha:]]\+/\n/gp' /etc/init.d/functions |sort |uniq -c
第二个命令删掉空行
cat /etc/init.d/functions |sed -n 's/[^[:alpha:]]\+/\n/gp' |sed '/^$/d' |sort |uniq -c |sort -n |wc -l
第三个命令。
sed -n 's/[^[:alpha:]]\+/\n/gp' /etc/init.d/functions |sed '/^$/d' /etc/init.d/functions |sort |uniq -c |wc -l
看看这三个命令执行的结果是什么——统计总行数
凌乱，第三行的结果和前面两个不一样，418行。。。。。
执行结果：
[root@centos7 data]# sed -n 's/[^[:alpha:]]\+/\n/gp' /etc/init.d/functions |sort |uniq -c
956
21 a
5 A
1 aA
1 abnormally
5 action
1 active
1 ActiveState
1 adjust
1 alive
2 all
1 already
2 and
1 And
3 any
1 anywhere
1 apply
1 Apply
1 are
3 arg
2 at
1 avoid
7 awk
8 b
1 backup
2 bak
38 base
2 basename
2 bash
7 be
6 BEGIN
1 bg
13 bin
11 binary
1 bit
2 booleans
2 boot
21 BOOTUP
2 break
3 but
1 by
6 c
1 caller
3 can
8 case
1 cat
1 centi
2 cgexec
6 cgroup
3 CGROUP
1 Cgroups
4 check
2 Check
2 checkpid
5 checkpids
1 cmdline
2 code
8 COL
13 color
2 COLUMNS
3 command
1 condrestart
5 conf
2 configuration
1 confusing
1 consoletype
4 CONSOLETYPE
2 contains
9 continue
1 convert
1 Convert
1 core
1 COREFILE
4 corelimit
1 could
1 current
27 d
5 daemon
4 DAEMON
1 daemons
3 dead
1 debug
1 deci
1 declared
1 default
11 delay
1 deleted
1 dependencies
1 DEPENDENCIES
1 details
17 dev
1 dies
3 dir
1 directory
1 dirname
1 discard
10 do
1 doc
1 doesn
10 done
2 due
1 dump
6 e
57 echo
1 Echo
3 eE
1 elif
9 else
5 en
1 END
5 eq
1 errors
8 esac
16 etc
2 Evaluate
1 exe
3 exists
4 exit
1 exited
1 export
1 expression
1 eyes
18 f
2 fail
1 failed
1 FAILED
9 failure
3 FAILURE
1 false
4 fF
46 fi
58 file
4 files
1 filter
2 find
1 Find
2 First
2 foo
12 for
5 force
2 found
1 from
1 fsck
4 function
2 functions
1 further
1 g
1 G
1 generated
1 Get
4 gotbase
1 graphical
3 grep
1 h
2 had
1 have
2 honor
6 i
60 if
1 ignore
1 IGNORE
1 IGNORECASE
7 ignored
25 in
1 including
1 Inform
6 init
1 initialize
2 initscripts
1 installed
2 insufficient
1 into
18 is
6 it
1 its
1 keyword
34 kill
1 Kill
1 KILL
8 killlevel
4 killproc
1 ksh
1 l
1 lang
3 LANGSH
1 let
1 lets
2 level
3 lib
1 LIMIT
7 line
16 list
1 little
1 lL
1 LoadState
37 local
1 locale
8 lock
1 locked
5 Log
1 LOGLEVEL
2 Look
1 looks
1 Looks
10 LSB
2 lt
7 m
1 make
1 Make
1 matching
1 may
1 micro
1 mili
1 most
6 MOVE
39 n
1 nano
5 ne
7 nice
4 nicelevel
3 NICELEVEL
3 nN
1 NOLOCALE
6 NORMAL
6 not
14 null
13 o
7 of
2 OK
2 old
1 on
5 only
3 oO
2 option
3 options
3 or
2 orig
1 otherwise
2 our
1 out
1 output
1 Output
24 p
4 passed
1 PASSED
1 path
2 PATH
73 pid
11 pidfile
2 pidfileofproc
8 pidof
2 pidofproc
21 pids
1 PIDs
1 piko
1 plural
4 plymouth
5 PPID
7 printf
1 privilege
1 privileges
8 proc
1 processes
1 profile
8 prog
15 program
5 Program
1 propagating
3 q
8 r
11 rc
19 RC
2 read
1 Read
1 readlink
1 reality
1 recognizes
2 redirect
1 REDIRECT
4 reload
2 Reloading
1 RemainAfterExit
4 remaining
1 Remove
1 requested
2 RES
3 restart
1 Restarting
3 ret
54 return
1 returns
1 Returns
8 retval
1 rm
1 rpm
2 rpmnew
2 rpmorig
2 rpmsave
1 rR
1 RS
14 run
1 Run
8 running
1 runuser
12 s
1 S
1 same
2 sane
2 Save
3 sbin
1 screen
1 script
1 scripts
1 search
1 sec
1 second
2 seconds
3 sed
2 See
1 seem
1 self
3 serial
6 service
3 set
2 Set
16 SETCOLOR
1 settings
1 sh
1 share
1 shell
1 Shell
18 shift
2 should
4 show
4 shutdown
2 shvar
2 signal
1 SKIP
3 sleep
1 smhd
1 some
3 something
3 SOURCED
1 sourcing
1 specified
2 sS
1 stage
3 start
1 Starting
2 startup
9 stat
1 state
6 status
3 stderr
13 stime
2 stop
1 stopped
1 Stopping
5 STRING
2 strstr
2 style
1 SubState
3 subsys
1 succeeded
7 success
3 SUCCESS
2 sure
5 syntax
7 sysconfig
16 sysctl
1 system
16 systemctl
2 SYSTEMCTL
8 systemd
2 t
7 term
1 TERM
3 test
5 Test
1 TEXTDOMAIN
5 that
13 the
52 then
2 they
1 this
2 This
1 time
10 to
6 TO
1 true
9 try
2 tT
1 txt
1 ulimit
2 umask
1 unit
1 unknown
1 unless
1 unset
2 up
2 update
9 Usage
4 use
3 used
1 Useful
9 user
1 using
5 usr
1 uU
2 v
1 value
13 var
6 verbose
4 via
5 warning
5 WARNING
1 We
1 where
1 whether
3 while
1 width
1 will
2 with
14 x
1 xcondrestart
1 xforce
1 xreload
1 xrestart
1 xstart
1 xstop
1 xtry
3 yes
2 yY
28 z
这两个命令执行并比对之后：
哈哈哈，两种用法结果居然不一样~~~~~~
我觉得是因为sed用法，遇到不包括单词的就换行，导致行数比grep用法的多~~~~~
来源：CSDN
作者：suika_xiaoyuzhenren
链接：https://blog.csdn.net/suika_xiaoyuzhenren/article/details/102664116