Shell

If [-N ' $]Thenecho "111"Elseecho "222"FiExit 0Execute SH my.sh par hint syntax error:unexpected end of file. Error excuse me. Text editing is a file written by Notepad under Windows, running under the Cygwin simulation Linux software environment.

$: The script name, relative path, or absolute path depends on how the call is being invoked. If the./dollartest.sh call is in the parent directory, then $ is./dollartest.sh, if it is a full path call, such as "/root/test/dollartest.sh", then $ is "/

Test can be understood to be the same as [], [[]] in logic and logic or at times, it can be split into multiple [] [Cmd-a cmd] #!/bin/bash a=23; If [$a-gt 18-a $a-lt] then echo ' Young && handsome ' else echo ' Just so ... " fi

Http://www.cnblogs.com/chengmo/archive/2010/10/23/1858879.html In daily life, random numbers are actually often encountered, want to throw dice, lottery, and draw lots. Oh, very simple can be achieved. So in doing programming, really to design a

Let's take a look at the return value of the two functions to get the way: #!/bin/bash #函数返回值获取测试. function fun_test () { #在函数内部是不能有其他的任何一条打印语句. Echo } val=$ (fun_test) echo $val Another one: #!/bin/bash #函数返回值获取测试. function fun_test

Http://www.ha97.com/4021.html 1. Delete 0-byte filesFind-type f-size 0-exec rm-rf {}; 2. View processArrange by memory from large to smallPS-E-O "%c:%p:%z:%a" |sort-k5-nr 3. By CPU utilization from large to small arrangementPS-E-O "%c:%p:%z:%a"

how Shell arrays operate number of array elements ${#array [@]} all elements of an array ${array[*]} string length ${#str} 1, get the number of elements of the array: array= (Bill Chen Bai Hu); num=${#array [@]}///Get the number of array

Use in shell programming to determine parameters within the IF statement –b returns True when file exists and is a block file -C Returns True when file exists and is a character file -D returns True when pathname exists and is a directory -E Returns

In the Linux shell command expr is not very noticeable, but it works very well. So far, I personally think the biggest role is two-arithmetic and string operations. First said arithmetic, in the shell arithmetic not simple subtraction, should write

Cat pushfiletoremoteservice.sh #!/bin/sh Basedir= "' DirName $ '" arg_cnt=$#If [$ARG _cnt-lt 3]; Then echo "Please use: $ dst_ip sshuser path_app-core" echo "Eg: $1.1.1.1 user/opt/app-core/" Exit fidst_ip=$1; dst_user=$2;if [[[] $ =~. *[^/]$]];

command Substitution In Bash, $ () and ' (inverted quotes) are used for command substitution.The command substitution is similar to the variable substitution, which is used to reorganize the command line, complete the command line in the quotation

Original:Http://blog.pureisle.net/archives/1352.html The Shell provides a large number of basic operations that are useful in scripting. The Shell evaluates the arithmetic expression you provide, performs an operation expansion, and replaces an

-S file file is somefile 0 o'clock [f]: Determines whether it is a file [- X "/bin/ls"]: Determines whether/BIN/LS exists and has executable permissions [-n "$var]": Judge $va 　　　　　R variable has a value ["$a" = "$b"]: To determine if $a and $b

#!/bin/sh For f in * Todo MV $f ' echo $f | TR "[: Upper:]" [: Lower:] "' Done ---------------------------------------------------------- [: Upper:] [A-z] [: Lower:] [A-z] [:d Igit:] [0-9] [: Alnum:] [0-9 A-z] [: space:] spaces or t a b keys [:

 Experimental three shell program design: Shell Foundation Experimental purposes:Further consolidate the basic grammar of Shell programming language and deepen the understanding of the learned knowledge. Experimental requirements1. Use of four

The difference between Su and Su- The former only switches identities, but the shell environment is still the original user's shell, while the user and the shell environment switch to the new user. The PATH environment variable error will not

Just started contacting the mongdb shell. Here is a record of the learning process. Open the shell in the console. Linux Environment:/usr/local/mongo/bin/mongo Window Environment: D:\mongodb\mongodb-win32-i386-2.0.6\bin>mongo The basic section

Transferred from: http://www.cnblogs.com/penghong2014/p/6065838.html 1. First download historian.py script, download address: Https://github.com/google/battery-historian2. Unzip the download and go to the

if [$#! = 2] Then if [$ = "H"-O $ = "H"] Then echo "Help Info" Else echo "Error:invalid argument amount! Plz Input 2 directory names! " Fi echo "**************************************************************" echo "* by Richard Zhang, Oct, 2008.

Enter HBase Shell console $HBASE _home/bin/hbase Shell If you have Kerberos authentication, you need to use the appropriate keytab for authentication (using the Kinit command), and then use the HBase shell to enter the certificate successfully. You