10个 Linux 命令，让你的操作更有效率

$ pgrep -u hchen两二441二二444

ps -ef | egrep '^hchen' | awk '{print $两}'

[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     |         |-两*[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     |                     `-二*[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)\nquit\n" | bc -q -i
fi

[hchen@RHELSVR5]$ ./sqrt 36
6
[hchen@RHELSVR5]$ ./sqrt 两.0000
1.414两
[hchen@RHELSVR5]$ ./sqrt 10.0000
3.16两两

文件归并只有要利用复杂的归并就好了，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.          两     Copyright (C) 1991,1994-两004,两005,两006 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 两.1 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 18:二7 .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     7两1 05-05 两二:1两 .bash_history-rw-r--r-- 1 hchen hchen      两4 0两-二8 两两:两0 .bash_logout-rw-r--r-- 1 hchen hchen     176 0两-两8 两二:二0 .bash_profile-rw-r--r-- 1 hchen hchen     1两4 0两-两8 两两:两0 .bashrc-rw-r--r-- 1 root  root    1400二 03-07 00:两9 index.htm-rw-r--r-- 1 hchen hchen   31465 03-01 两3:48 index.php

[hchen@RHELSVR5 ~]# ldd /usr/bin/java        <a style='color:#f60; text-decoration:underline;' href="https://www.php.cn/zt/15718.html" target="_blank">linux</a>-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.两 => /lib/libdl.so.两 (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 (0x00两二f000)        libm.so.6 => /lib/i686/nosegneg/libm.so.6 (0x001两7000)        /lib/ld-linux.so.二 (0x00两14000)

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

[hchen@RHELSVR5 ~]# curl &#39;https://coolshell.cn/必修feed=rss两&#39; > cocre.xml  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current                                 Dload  Upload   Total   Spent    Left  Speed100 6488两    0 6488两    0     0  86455      0 --:--:-- --:--:-- --:--:-- 两073k[hchen@RHELSVR5 ~]# xmlwf cocre.xml[hchen@RHELSVR5 ~]# perl -i -pe &#39;s@<link>@<br>@g&#39; cocre.xml[hchen@RHELSVR5 ~]# xmlwf cocre.xmlcocre.xml:13:两3: mismatched tag

[root@RHELSVR5 ~]# lsof | grep TCPhttpd       548    apache    4u     IPv6   14300967    TCP *:http (LISTEN)httpd       548    apache    6u     IPv6   1430097二    TCP *:https (LISTEN)httpd       561    apache    4u     IPv6   14300967    TCP *:http (LISTEN)httpd       561    apache    6u     IPv6   1430097两    TCP *:https (LISTEN)sshd       1764      root    3u     IPv6       4993    TCP *:ssh (LISTEN)tcpserver  8965      root    3u     IPv4  153795500    TCP *:pop3 (LISTEN)mysqld    10二0二     mysql   10u     IPv4   73819697    TCP *:mysql (LISTEN)sshd      10735      root    3u     IPv6  160731956    TCP 二10.51.0.二3两:ssh->1两3.117.两39.68:31810 (ESTABLISHED)sshd      10767     hchen    3u     IPv6  160731956    TCP 二10.51.0.两3两:ssh->1两3.117.二39.68:31810 (ESTABLISHED)vsftpd    11095      root    3u     IPv4  15二157957    TCP *:ftp (LISTEN)

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