Linux是一个弱小的操作系统,这篇文章收集了6个你可能没有用过的Linux命令,但却相当的有用,供大家参考。
1)bc
这个Linux命令用于精度比拟高的数学运算。如:开平方根等。上面利用bc命令写个脚本(文件名:sqrt)
#!/bin/bashif [ $thenecho 'Usage: sqrt number'exit 1elseecho -e "sqrt($1)nquitn" | bc -q -ifi
接着,可应用这个脚本进行平方根运算:
[hchen@RHELSVR5]$ ./sqrt 366[hchen@RHELSVR5]$ ./sqrt 2.00001.4142[hchen@RHELSVR5]$ ./sqrt 10.00003.1622
2)split
如果你的文件很大,却接到命令要把它宰割成小文件,那么这个命令就派上用场了。
[hchen@RHELSVR5 applebak]# ls -l largefile.tar.gz-rw-r--r-- 1 hchen hchen 436774774 04-17 02:00 largefile.tar.gz[hchen@RHELSVR5 applebak]# split -b 50m largefile.tar.gz LF_[hchen@RHELSVR5]# ls -l LF_*-rw-r--r-- 1 hchen hchen 52428800 05-10 18:34 LF_aa-rw-r--r-- 1 hchen hchen 52428800 05-10 18:34 LF_ab-rw-r--r-- 1 hchen hchen 52428800 05-10 18:34 LF_ac-rw-r--r-- 1 hchen hchen 52428800 05-10 18:34 LF_ad-rw-r--r-- 1 hchen hchen 52428800 05-10 18:34 LF_ae-rw-r--r-- 1 hchen hchen 52428800 05-10 18:35 LF_af-rw-r--r-- 1 hchen hchen 52428800 05-10 18:35 LF_ag-rw-r--r-- 1 hchen hchen 52428800 05-10 18:35 LF_ah-rw-r--r-- 1 hchen hchen 17344374 05-10 18:35 LF_ai反而来,合并也只须要简略的合并就行,如:[hchen@RHELSVR5]# cat LF_* >largefile.tar.gz
3)pgrep
pgrep名字前有个p,能够猜测它可能和grep无关,的确这是过程相干的grep命令。不过,这个命令次要是用来列举过程ID的。如:
$ pgrep -u hchen2244122444
这个命令相当于:
ps -ef | egrep '^hchen' | awk '{print $2}'
4)nl
nl命令其它和cat命令很像,只不过它会打上行号。如下所示:
[hchen@RHELSVR5 include]# nl stdio.h | head -n 101 /* 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/or5 modify it under the terms of the GNU Lesser General Public6 License as published by the Free Software Foundation; either7 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,
5)ldd
这个命令,用来可执行文件所应用了动态链接库。如:
[hchen@RHELSVR5 ~]# ldd /usr/bin/javalinux-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)
6)col
这个命令,能将man文件转成纯文本文件。如下示例:
# PAGER=cat# man less | col -b > less.txt
这6个Linux命令,你是否用过,欢送留言交换哈!
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