tr -[dsx] seting ...
使用tr替换字符：
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3
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5
6
7
8
9
10
11
12
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[whx@localhost ~]$ last |
head
-n 5 |
tr
'[a-z]'
'[A-Z]'
WHX PTS
/0
192.168.21.1 SUN AUG 27 18:22 STILL LOGGED IN
REBOOT SYSTEM BOOT 2.6.32-696.EL6.X SUNAUG 27 18:21 - 00:39 (06:18)
WHX PTS
/0
192.168.21.1 THU AUG 24 18:37 - 02:54 (08:17)
WHX TTY1 :0 THU AUG 24 18:36 - DOWN (08:18)
REBOOT SYSTEM BOOT 2.6.32-696.EL6.X THUAUG 24 18:35 - 02:55 (08:19)
[whx@localhost ~]$ last |
head
-n 5
whx pts
/0
192.168.21.1 Sun Aug 27 18:22 still logged
in
reboot system boot 2.6.32-696.el6.x SunAug 27 18:21 - 00:39 (06:18)
whx pts
/0
192.168.21.1 Thu Aug 24 18:37 - 02:54 (08:17)
whx tty1 :0 Thu Aug 24 18:36 - down (08:18)
reboot system boot 2.6.32-696.el6.x ThuAug 24 18:35 - 02:55 (08:19)
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添加-d参数删除字符：
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2
3
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5
6
7
8
9
10
11
12
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[whx@localhost ~]$
cat
/etc/passwd
|
head
-n5
root:x:0:0:root:
/root
:
/bin/bash
bin:x:1:1:bin:
/bin
:
/sbin/nologin
daemon:x:2:2:daemon:
/sbin
:
/sbin/nologin
adm:x:3:4:adm:
/var/adm
:
/sbin/nologin
lp:x:4:7:lp:
/var/spool/lpd
:
/sbin/nologin
[whx@localhost ~]$
cat
/etc/passwd
|
head
-n5 |
tr
-d
':'
rootx00root
/root/bin/bash
binx11bin
/bin/sbin/nologin
daemonx22daemon
/sbin/sbin/nologin
admx34adm
/var/adm/sbin/nologin
lpx47lp
/var/spool/lpd/sbin/nologin
|
添加-s参数去除重复字符：
|
1
2
|
[whx@localhost ~]$
echo
'thissss issss aaaa test'
|
tr
-s
'sa'
this is a
test
|
col常用于将man page转存为纯文本文件以方便查阅。
col -x 将tab替换成对等的空格键
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7
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9
10
11
12
13
14
15
16
17
18
19
20
21
22
|
[whx@localhost ~]$
cat
/etc/man
.config |
tail
-10 | col -x |
cat
-A|
tail
-10
#$
# Enable/disable makewhatis database cronupdates.$
# If MAKEWHATISDBUPDATES variable isuncommented$
# and set to n or N, cron scripts$
# /etc/cron.daily/makewhatis.cron$
# /etc/cron.weekly/makewhatis.cron$
# will not update makewhatis database.$
# Otherwise the database will be updated.$
#$
#MAKEWHATISDBUPDATES n$
[whx@localhost ~]$
cat
/etc/man
.config |
tail
-10 |
cat
-A
#$
# Enable/disable makewhatis database cronupdates.$
# If MAKEWHATISDBUPDATES variable isuncommented$
# and set to n or N, cron scripts $
# /etc/cron.daily/makewhatis.cron$
# /etc/cron.weekly/makewhatis.cron$
# will not update makewhatis database.$
# Otherwise the database will be updated.$
# $
#MAKEWHATISDBUPDATES^In$
|
expand转换指令：
expand [-t] file
使用-t参数设置使用6个空格键代替tab键（默认使用8个空格键代替tab键）
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1
2
3
4
5
6
7
8
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[whx@localhost ~]$
grep
'^MANPATH'
/etc/man
.config |
head
-n 3 |
expand
-t 6 |
cat
-A
MANPATH
/usr/man
$
MANPATH
/usr/share/man
$
MANPATH
/usr/local/man
$
[whx@localhost ~]$
grep
'^MANPATH'
/etc/man
.config |
head
-n 3 |
cat
-A
MANPATH^I
/usr/man
$
MANPATH^I
/usr/share/man
$
MANPATH^I
/usr/local/man
$
|
本文转自 天黑顺路 51CTO博客，原文链接：http://blog.51cto.com/mjal01/1960194，如需转载请自行联系原作者
