10個 Linux 命令，讓你的操作更有效率

$?pgrep?-u?hchen2244122444

ps?-ef?|?egrep?'^hchen'?|?awk?'{print?$2}'

[hchen@RHELSVR5?~]$?pstreeinit-+-acpid?????|-auditd-+-python?????|????????`-{auditd}?????|-automount---4*[{automount}]?????|-backup.sh---sleep?????|-dbus-daemon?????|-events/0?????|-events/1?????|-hald---hald-runner---hald-addon-acpi?????|-httpd---10*[httpd]?????|-irqbalance?????|-khelper?????|-klogd?????|-ksoftirqd/0?????|-ksoftirqd/1?????|-kthread-+-aio/0?????|?????????|-aio/1?????|?????????|-ata/0?????|?????????|-ata/1?????|?????????|-ata_aux?????|?????????|-cqueue/0?????|?????????|-cqueue/1?????|?????????|-kacpid?????|?????????|-kauditd?????|?????????|-kblockd/0?????|?????????|-kblockd/1?????|?????????|-kedac?????|?????????|-khubd?????|?????????|-6*[kjournald]?????|?????????|-kmirrord?????|?????????|-kpsmoused?????|?????????|-kseriod?????|?????????|-kswapd0?????|?????????|-2*[pdflush]?????|?????????|-scsi_eh_0?????|?????????|-scsi_eh_1?????|?????????|-xenbus?????|?????????`-xenwatch?????|-migration/0?????|-migration/1?????|-6*[mingetty]?????|-3*[multilog]?????|-mysqld_safe---mysqld---9*[{mysqld}]?????|-smartd?????|-sshd---sshd---sshd---bash---pstree?????|-svscanboot---svscan-+-3*[supervise---run]?????|?????????????????????|-supervise---qmail-send-+-qmail-clean?????|?????????????????????|????????????????????????|-qmail-lspawn?????|?????????????????????|????????????????????????`-qmail-rspawn?????|?????????????????????`-2*[supervise---tcpserver]?????|-syslogd?????|-udevd?????|-watchdog/0?????|-watchdog/1?????-xinetd

#!/bin/bash if?[?$#?-ne?1?] then ????echo?'Usage:?sqrt?number' ????exit?1else ????echo?-e?"sqrt($1)nquitn"?|?bc?-q?-i fi

[hchen@RHELSVR5]$?./sqrt?36 6 [hchen@RHELSVR5]$?./sqrt?2.0000 1.4142 [hchen@RHELSVR5]$?./sqrt?10.0000 3.1622

文件合并只需要使用簡單的合并就行了，如：

[hchen@RHELSVR5]#??cat?LF_*?>largefile.tar.gz

[hchen@RHELSVR5?include]#?nl?stdio.h?|?head?-n?10?????1??/*?Define?ISO?C?stdio?on?top?of?C++?iostreams.??????????2?????Copyright?(C)?1991,1994-2004,2005,2006?Free?Software?Foundation,?Inc.??????????3?????This?file?is?part?of?the?GNU?C?Library.??????????4?????The?GNU?C?Library?is?free?software;?you?can?redistribute?it?and/or??????????5?????modify?it?under?the?terms?of?the?GNU?Lesser?General?Public??????????6?????License?as?published?by?the?Free?Software?Foundation;?either??????????7?????version?2.1?of?the?License,?or?(at?your?option)?any?later?version.??????????8?????The?GNU?C?Library?is?distributed?in?the?hope?that?it?will?be?useful,

[hchen@RHELSVR5?~]#?mkfifo?/tmp/hchenpipe [hchen@RHELSVR5?~]#?ls?-l?/tmpprw-rw-r--?1?hchen??hchen??0?05-10?18:58?hchenpipe

[hchen@RHELSVR5?~]#?ls?-al?>?/tmp/hchenpipe

[hchen@RHELSVR5?~]#?head?/tmp/hchenpipedrwx------?8?hchen?hchen????4096?05-10?18:27?.drwxr-xr-x?7?root??root?????4096?03-05?00:06?..drwxr-xr-x?3?hchen?hchen????4096?03-01?18:13?backup-rw-------?1?hchen?hchen?????721?05-05?22:12?.bash_history-rw-r--r--?1?hchen?hchen??????24?02-28?22:20?.bash_logout-rw-r--r--?1?hchen?hchen?????176?02-28?22:20?.bash_profile-rw-r--r--?1?hchen?hchen?????124?02-28?22:20?.bashrc-rw-r--r--?1?root??root????14002?03-07?00:29?index.htm-rw-r--r--?1?hchen?hchen???31465?03-01?23:48?index.php

[hchen@RHELSVR5?~]#?ldd?/usr/bin/java????????linux-gate.so.1?=>??(0x00cd9000)????????libgij.so.7rh?=>?/usr/lib/libgij.so.7rh?(0x00ed3000)????????libgcj.so.7rh?=>?/usr/lib/libgcj.so.7rh?(0x00ed6000)????????libpthread.so.0?=>?/lib/i686/nosegneg/libpthread.so.0?(0x00110000)????????librt.so.1?=>?/lib/i686/nosegneg/librt.so.1?(0x009c8000)????????libdl.so.2?=>?/lib/libdl.so.2?(0x008b5000)????????libz.so.1?=>?/usr/lib/libz.so.1?(0x00bee000)????????libgcc_s.so.1?=>?/lib/libgcc_s.so.1?(0x00aa7000)????????libc.so.6?=>?/lib/i686/nosegneg/libc.so.6?(0x0022f000)????????libm.so.6?=>?/lib/i686/nosegneg/libm.so.6?(0x00127000)????????/lib/ld-linux.so.2?(0x00214000)

#?PAGER=cat#?man?less?|?col?-b?>?less.txt

[hchen@RHELSVR5?~]#?curl?'https://coolshell.cn/?feed=rss2'?&gt;?cocre.xml??%?Total????%?Received?%?Xferd??Average?Speed???Time????Time?????Time??Current?????????????????????????????????Dload??Upload???Total???Spent????Left??Speed100?64882????0?64882????0?????0??86455??????0?--:--:--?--:--:--?--:--:--?2073k[hchen@RHELSVR5?~]#?xmlwf?cocre.xml[hchen@RHELSVR5?~]#?perl?-i?-pe?'s@<link>@<br>@g'?cocre.xml[hchen@RHELSVR5?~]#?xmlwf?cocre.xmlcocre.xml:13:23:?mismatched?tag

[root@RHELSVR5?~]#?lsof?|?grep?TCPhttpd???????548????apache????4u?????IPv6???14300967????TCP?*:http?(LISTEN)httpd???????548????apache????6u?????IPv6???14300972????TCP?*:https?(LISTEN)httpd???????561????apache????4u?????IPv6???14300967????TCP?*:http?(LISTEN)httpd???????561????apache????6u?????IPv6???14300972????TCP?*:https?(LISTEN)sshd???????1764??????root????3u?????IPv6???????4993????TCP?*:ssh?(LISTEN)tcpserver??8965??????root????3u?????IPv4??153795500????TCP?*:pop3?(LISTEN)mysqld????10202?????mysql???10u?????IPv4???73819697????TCP?*:mysql?(LISTEN)sshd??????10735??????root????3u?????IPv6??160731956????TCP?210.51.0.232:ssh->123.117.239.68:31810?(ESTABLISHED)sshd??????10767?????hchen????3u?????IPv6??160731956????TCP?210.51.0.232:ssh->123.117.239.68:31810?(ESTABLISHED)vsftpd????11095??????root????3u?????IPv4??152157957????TCP?*:ftp?(LISTEN)

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