Shell

First, the demand      original file a for 1.7g file, with 5 1700 Mangyo look. There are also 2 auxiliary files b and C, b c files are only 2 column. a1 and b1 same, A2 and C1 a1 B2, c2" a4 a5, the target file is named d.txtSecond,

1:declare commandshell Default is String typeIf subtraction is required, it needs to be defined as an integral typeDECLARE command: Change the default variable type Decalre [+/-] [option] Variable name-set type properties for variables+ Cancel

Directory:First, the operation Principle of shell programSecond, Shell common skills1. Command history2. Command aliases3. Command Reference4. File name Wildcard5. Common shortcut keys6. Complement function7. Input and output redirection and piping8.

When the shell executes a command, it returns a return value that is saved in the shell variable $? In When $? = = 0 o'clock, indicating successful execution; = = 1 o'clock, which indicates that the execution failed.    www.2cto.com   Sometimes the

1.cdCD-Back to last catalogCD returns the current user's home directory2.mkdirMkdir-p Creating a multilevel directoryEg:mkdir-p Test1/test2/test33.findFind-empty Finding empty DocumentsFind-user XXX View all information about user xxxFind-mtime-1

Because I usually write some small experimental script, every time to write author,description and so very troublesome, then wrote such a script can create their own small script, code as follows, pure personal original, relatively rough, big God

　　#!/bin/bashif [$#-ne 1];then echo "usage:$0 filename"; Exit-1fifilename=$1egrep-o "\b[[:alpha:]]+\b" $filename | awk ' {count[$0]++}end{printf ("%-14s%s\n", "Word", "Count"), for (Ind in count) {printf ("%-14s%d\n", Ind,count[ind]);}}

List the number of connections per IPawk ' /^tcp/{print} ' awk ' !/^::/{print $ {} ' Sort Uniq Sort awk ' begin{printf "%-10s%s\n", "Connum", "IP"}{printf "%-10s%s\n", $1,$2} 'Command explanation: Netstat-n refused to display aliases, can

1. Describe the operation principle of shell program (can be attached with necessary graphic instructions);2, summarize all the knowledge points involved in shell programming (such as: variables, grammar, command status, etc., to take the picture of

character meaning * Match 0 or more characters ? Match any one character [list] Match any single character in the list [!list] Matches a character other

Introduction:The previous article, Sqoop1.4.4, implements the import of incremental data from oracle10g into Hive0.13.1 and updates the primary table http://www.linuxidc.com/Linux/2014-09/106282 in hive. The HTM describes the principle of

Tag:shell    function     menu print     [[email protected] scripts]# cat menu.sh #!/bin/bash################################# ## filename: menu.sh# describe: choose a place to eat# author:  lijun# create date: 2015-09-09# version: 1.0##############

First, use '. ' Perform1. Contents of the file:a.sh#!/bin/sha=2echo a= $ab.sh#!/bin/sh./a.shecho a.sh:a= $a2. Add executable permissions# chmod +x a.sh b.sh3. Running#./b.sh a=2a.sh:a=It can be seen that a in b.sh does not get the A variable in a.sh,

1. If while command is written in one lineWhile read a b;do echo $a $b;d one 12 13 14Cat Aa.txt12 13 14if [[$i-eq 0 | | $i-eq 2]]; then env=10.79.40.146:80; else env=10.79.40.147:80; Fi2. Awk merges two filesAccount CdrCat AccountZhang San

#!/bin/bashfor I in {1..9}dofor j in ' seq 1 $i ' dom= ' echo "$i" "*" "$j" |bc ' Echo-n "$j" x "$i" = "$m" "" Doneecho "" DoneExecution Result:[Email protected] shell]#./99.sh1 x 1 = 11 x 2 = 2 2 x 2 = 41 x 3 = 3 2 x 3 = 6 3 x 3 = 91 x 4 = 4 2 x 4 =

#!/bin/sh# Licensed to the Apache software Foundation (ASF) under one or more# Contributor license agreements. See the NOTICE file distributed with# This work for additional information regarding copyright ownership.# The ASF licenses this file to

PS: Only consider the latest version of Scala and python2.x, due to the difference between python3.x and python2.x, and the mainstream of some open source projects are used Python2, currently python2 a little bit compatible python31.

This article is intended to review the definition and assignment of arrays in shell script programming, to read arrays, and to get the length of an arrayKnowledge Reserve Array : Multiple contiguous separate memory spaces, each memory

PackageCom.edu.hpu.sort.insert.shell;Importjava.util.Arrays;ImportCom.edu.hpu.sort.Sort; Public classShellsortextendsSort {@Override Public int[] Dosort (int[] arr) { intLen =arr.length; //all step probabilities (for the first half of the

Multi-thread Linux Shell script and linuxshell In bash, we run (&) in the background to implement multithreading. for((i=1;i We have added {} & so that the execution in {} can be performed in the background. The above is equivalent to executing