Puff---------Linux bash scripting---user interaction

System Administration Section One:

partitioning, creating, viewing, resizing, mounting, file system structure, hard links, soft links

Script "syntax error" non-logical error detection:

# bash-n Script.sh

Executed separately, the script executes each code

# bash-x Script.sh

+ Program in execution

No + information that should be output during the program

Format of the script

+++++++++++++++++++++++++++++++++ non-format for splitting ++++++++++++++++++++++++++++++++++

#!/bin/bash # #魔数

# Version:major.minor.release (main version presented, minor version presented, issue number)

# Author: # #作者

# Description: # #对脚本的描述信息

+++++++++++++++++++++++++++++++++ non-format for splitting ++++++++++++++++++++++++++++++++++

#号开头为注释

Read command

1. View all built-in commands [[email protected] ~]# enable-aenable .... Enable read # #内建命令2, get help [[email protected] ~]# assist Readread a line F Rom the standard input and split it into field. After a row has been read from the normal input, cut the line into fields with white space characters, save the field to the variable ****** for a special scene, a scene that requires people to participate **********read [ OPTIONS ....]    [Name ...] -P "PROMPT" # # hint-t Timeout # # Timeout long, in seconds read-p "Enter a name:" Name equals: Echo-n "Enter a name:"; Read name

Using the example

1, a row from the standard input read, cut this line into a field, the bit to save the field into the variable

[email protected] ~]# Read Namehello obama! [Email protected] ~]# echo $namehello obama! [email protected] ~]# read Nameobama[[email protected] ~]# echo $nameobama

2, the bit to save the field interpretation, if the extra bit, the variable is empty

[email protected] ~]# read a b chello obama! [[email protected] ~]# echo $ahello [[email protected] ~]# echo $bobama! [Email protected] ~]# echo $c [[email protected] ~]#

3. Wait for user input command

Syntax: read-p ' PROMPT ' name

Equivalent: Echo-n "PROMPT"; Read name

[[email protected] ~]# printf "Enter a username:"; Read NameEnter a username:obama[[email protected] ~]# echo $nameobama [[email protected] ~]#

4, to avoid user input, plug in here, give a timeout. The variable is empty at this time

[[email protected] ~]# read-t 5-p ' Enter a name: ' NameEnter a name: [[email protected] ~]# echo $name [[email protected] ~]#

Script Example:

Prompts the user to enter a device file, which displays the disk information.

1. Scripts

#!/bin/bash# version:0.0.1# author:lcc.org# desc:read testingread-t 5-p ' Enter a disk special file: ' diskfile[-n ' $ Diskfile "] | | Exit 1 # # does not exist, then exit if Fdisk-l |        Fgrep "Disk $diskfile" >/dev/null 2>&1then fdisk-l $diskfile # # condition The execution status result is 0 exit 0else        echo "No such file." # # Condition Execution status result is not 0 exit 1fi

2. Detect syntax errors

[Email protected] scripts]# bash-n test.sh

3. Give x permission

[Email protected] scripts]# chmod +x test.sh

4. Give a path test

1. correct path [[Email protected] scripts]# ./test.shenter a disk special file:  /dev/sdadisk /dev/sda: 128.8 gb, 128849018880 bytes255 heads, 63  sectors/track, 15665 cylindersunits = cylinders of 16065 * 512  = 8225280 bytesSector size  (logical/physical):  512 bytes / 512  bytesI/O size  (Minimum/optimal): 512 bytes / 512 bytesdisk  identifier: 0x000777f3   device boot      start          End      Blocks    Id  System/dev/sda1   *            1          64       512000   83   linuxpartition 1 does not end on cylinder boundary./dev/sda2               64        12813   102400000   8e  Linux LVM/dev/sda3            12813       14118     10489811   83  Linux/dev/sda4            14119       15665     12426277+   5  Extended/dev/sda5            14119       15424    10490413+   82  LINUX SWAP / SOLARIS2, error path [[email protected] scripts]#  ./test.shenter a disk&Nbsp;special file: howno such file. [[email protected] scripts]# echo $?1[[email protected] scripts]#

This article is from the "Reading" blog, make sure to keep this source http://sonlich.blog.51cto.com/12825953/1955162

Puff---------Linux bash scripting---user interaction