Shell

The logical operators of the shell involve the following types, so as long as the appropriate choice, can solve our many complex judgments, to achieve a multiplier effect.First, the logical operator Logical Volume Label Express

Linux Shell reads a lineMethod OneBy specifying IFS--Internal Field Separator , by IFS default , you can set a value in the script IFSDEMO 1$cat t1.txt abcfd $cat test_IFS.sh #! /bin/shIFS="c"for LINE in `cat t1.txt`do echo $LINEdone$sh

Article from my personal blog: (Linux shell) Chapter II-The Joy of command (a)In the previous chapter we described some of the syntax that we need to be aware of in the Linux shell, and then we begin to understand the common commands of the Linux

1. Obtain the IPv4 address of a single network adapter. The method is as follows:Method 1:$/Sbin/ifconfig ethx | awk '/inet ADDR/{print $2}' | cut-F2-d ":"Method 2:$/Sbin/ifconfig ethx | awk '/inet ADDR/{print $2}' | awk-F: '{print $2 }'Method

'.' Matches any character '*' Specifies that * can be used repeatedly for any number of times. '^' Starts with a string '$' String end '. *' Any number of characters '\' Escape Character '[...]' Matches any character '[^...]'

Recently, Google was completely banned, and the code hosted on the Google SVN server was inaccessible.It's a waste of things. I unloaded the slow Win8 running in my old notebook, installed Ubuntu, mounted the svn server, and managed some personal

Understanding and learning Shell The shell version used in Linux is called "Bourne again shell (BASH)". This shell is an enhanced version of the Bourne shell and developed based on the GNU architecture.BASH Shell functions 1. Command memory function:

[[email protected] Learn]# cat useradd-final.sh #!/bin/bash#DEBUG=0ADD=0DEL=0help() {echo "Usage: $(basename $0) -v | --verbose | --add user1,user2,... | --del user1,user2,... | -h | --help"}while [ $# -ne 0 ]docase $1 in-h | --help )helpexit 0;;-v |

Format For name in list Do Loop body Done Example: List the usernames, uid, and shell in the/etc/passwd file, Row 1, 3, 6, and

Scan all hosts in the network segment. Online hosts are displayed in green. Offline hosts are displayed in red; Finally, the numbers of online and offline hosts are displayed respectively; In order to practice shell, only the for loop is used here,

  Typeset can be used to set variable attributes, such as case, width, and left-right alignment. When typeset is used to change the attributes of a variable, this change is permanent, the following uses KSh as an example to demonstrate the

Tag: Shell Shell task control terms: (1) Foreground task: Run in shell. The shell prompt does not appear before the task is completed, so other tasks cannot be run at the same time. (2) Background task: Run in shell, but not exclusively in shell.

Location parameters can be used shiftCommand left shift. For example shift 3Indicates the original $4Change $1, The original $5Change $2And so on. $1, $2, $3Discard, $0Do not move. Without Parameters shiftThe command is equivalent shift 1. Very

/* Configure /*------------------------------------------------------------------------------------------- @ Blackeye poet Optional --------------------------------------------------------------------------------------------*/ I. wildcard

Method 1: #!/bin/bashc=0for i in `seq -w 18 31`;do while [ $c -ge 3 ];do c=$(jobs -p |wc -w) sleep 1s done bash run_cal_us_tmp.sh 201407$i & #echo "`sleep 5s`haha" & c=$(jobs -p |wc -w)done Advantages: easy to implement Disadvantage: If

There are many blank lines after extracting the log files to be viewed recently, which is not conducive to the comparison of previous files. In order to be backward compatible, only empty lines can be deleted when obtained. I googled myself and used

The script is as follows: #! /Bin/sh # Name of the process to be checked progress_name = "heihu_server" # ------------------------------- # function: checkprogress # function: Check whether a process exists # parameter: $1 --- Name of the process to

Three types of commands can be used in shell scripts: >>> Unix Commands Although any Unix command can be used in shell scripts, some more common commands are used. These commands are usually used for file and text operations. Common command

#! /Bin/bashIP = $ (ip A | grep "Inet" | awk '{print $2}' | awk-F/'{print $1}' | grep-V 127.0.0.1 | awk' begin {rs = '\ n'} {$1 = $1; print $0} '| SED's //,/G') # retrieve all IP addresses except 127.0.0.1 and separate them with commas (,).Hostname =

Option name Format Description -Ls -Ls View the current directory structure of the specified path -LSR -LSR Recursively view the directory structure of a specified path -Du -Du Measure the file