Shell

In the load-spark-env.sh script below the spark bin , there are the following statements: If [-F "${user_conf_dir}/spark-env.sh"]; Then # Promote all variable declarations to environment (exported) variables set-a . "${user_conf_dir}/spark-

The call file system (FS) shell command should use the form $HADOOP _home/bin/hadoop FS.All FS shell commands use the URI path as the parameter.The URI format is Scheme://authority/path.The scheme for Hdfs,hdfs is HDFs, such as Hdfs://localhost:9000/

Learning basic Linux Commands Command Description $ ls This command was used to check the contents ofThe directory. $ pwd This command was used to check the presentWorking directory.

One, the main use of the Bash Shell in Linux; View the supported shell types available on Linux systems :Vim/etc/shellThe way to perform shel footsteps:1. Give footsteps the ability to execute permissions and invoke the script using a relative or

backgroundsed is a good file processing tool, itself is a pipeline command, mainly in the behavior of the unit processing, you can replace the data rows, delete, add, select and other specific work.SED is intended to be a stream editor (Streameditor)

#!/bin/sh ()  {        if [ -f $1 ];then                 case $1 in                    *.TAR.BZ2)       tar xjf $1       ;;                          *.tar.gz)        tar xzf $1       ;;                    *.BZ2)           bunzip2  $1      ;;         

First, grep ----"Line filter Tool" grep (Global search Regular expression (RE) and print out of the line, fully search regular expressions and Printing a line is a powerful text-search tool that can use regular expressions to search for text,

One. grepgrep (Globally search a Regular Expression and Print) is a powerful text search tool , it can use regular expressions to search for text, print matching rows, but does not affect the contents of the original file , and by the return value

In shell scripts, all of our variables are stored as strings. So it becomes very important for the interception of strings.In a shell script, if you want to specify a string for interception, there are several ways to do it:The following examples

$*[Email protected]DifferenceThe shift parameter moves forward one bit, moving the position variable.$?$n$#$$!$$#!/bin/shPidpath=/tmp/p.pidIf [-F "$pidpath"]ThenKILL-USR2 ' Cat $pidpath '/dev/null 2>&1Rm-f $pidpathFiecho $$ > $pidpathSleep 300One of

#函数: Must be defined before using#格式:#function_name () {# List of commands# [return value] #可以显示增加return语句, if not added, the last command runs the result as a return ##返回值只能是整数, generally used for function execution success or not, 0 for success,

Overview What is a shell?The shell acts as an interface between the user and the Linux system, allowing the user to enter commands that need to be executed to the operating system. This is much like the command prompt for Windows, but the strong is

Shell IntroductionThe shell is the user interface of the system and provides an interface for users to interoperate with the kernel. It receives the command entered by the user and feeds it into the kernel to execute.Running backgroundA basic Linux

#!/bin/bashSource/etc/profileSOURCE ~/.bash_profile##################################00 * * */bin/bash/utxt/soft/tools/rm_oracle.sh >>/utxt/soft/tools/rm_oracle.log 2>&1#################################lyd_rm_dt= ' date-d '-5 day "+%y%m%d"flow_rm_dt=

The actual combat target for the log desensitization, the log directory of all the files processed, all involved in the card number and password information, will be replaced by "*" number, to replace the contents are obtained from the corresponding

a.expr normal addition multiplication operation Note: Expr can only perform integer operationsExpr 2 + 2Expr 2-2Expr 2 \* 2Expr 2/2Attention:1. Operators and calculated numbers have at least one space around them2. Using multiplication sign, you

Commonly used arithmetic operators, assuming that variable A is 10 and variable B is 20:Operator Description Example+ addition ' expr $a + $b ' result is 30.- subtraction ' expr $a-$b ' result is 10.* multiply ' expr $a \* $b ' result is 200.

Print out 1,11,21,31,41 ... The shell scriptmethod One:#!/bin/Bash for((i=1;i the; i=i+Ten)); Doecho $i #cat-n/etc/services | Sed-n"${i}p"#sed-N"${i}p"/etc/ServicesdoneOperation process, first cycle:1;1echo "1"Second cycle:1=1+10=11;11echo "11"Third

# netstat-an| grep ': 80 ' | awk '/tcp/{a[$NF]++}end{for (i in a) print i,a[i]} '# echo "Current concurrency: ' netstat-ant | grep:80 | awk ' {print $} ' | Awk-f ":" ' {print $} ' | Sort | uniq-c | Sort-r-N | awk ' begin{total=0}{total+=$1}end{print

4-7 shellsort.c1#include 2#include"4-1 createdata.c" //function to generate random numbers3 #defineArraylen 10//number of data elements that need to be sorted4 voidShellsort (intA[],intN//Hill Sort5 {6 intd,i,j,x;7d=n/2;8