bash getopts

1. Introduction to getopts Thanks to the flexibility of shell command lines, write your ownCodeWhen judging, the complexity is relatively high. Use the Internal Command getopts to easily process command line parameters. The general format is: Getopts options variable Getopts is designed to run in a loop. Each tim

":" is added before each switch for the specified item s, m, d, and p, a parameter is required for this toggle. For details, see the code my_shell.sh. it implements the function of converting all parameters such as daily hours, minutes, and seconds to seconds: click (here) fold or open SECS = 0 MINUTES = 0 HOURS = 0 DAYS = 0 PROCESS = 0 while getopts: s: m: h: d: p TIMED 2>/dev/NullDC case $ TIMED in s) SECS = $ OPTARG; m) (MINUTES = $ OPTARG * 60);

by Francis_hao Jul 5,2017Getopts is a built-in command for the shell.OverviewGetopts optstringname [args]Optind,optarg,opterrDescribeGetopts is used by the shell program to analyze positional parameters,optstring contains the option characters that need to be recognized, if the character followed by a colon, indicating that the word check requires a parameter, the parameters need to be separated by a space. Colons and question marks cannot be used as option characters.Getopts each time it is cal

I. Introduction of GETOPTSBecause of the flexibility of the shell command line, the complexity is higher when you write code judgments. Command-line arguments can be easily handled using the internal command getopts. The General format is:Getopts Options VariableGetopts is designed to run in a loop, and each time a loop is executed, getopts checks the next command-line argument and determines if it is legit

getopts CommandUseProcesses command-line arguments and verifies valid options.Grammargetopts option string name [parameters ...]DescribeGetopts is designed to run in a loop, and each time a loop is executed, getopts checks the next command-line argument and determines if it is legitimate. That is, check whether the parameter starts with a--followed by a letter contained in the options. If it is, put the mat

It is necessary to specify the value of the command line option in the script. Getopts provides a way to place a colon after the option_string option, for example: Getopts abcsd: Option ABCs can be passed without adding actual parameter values, and option D must contain parameters. The variable optarg saves the value, the variable optind is used to store the next element location in the original $. #!

In writing shell scripts, we often have to deal with some input parameters, it is more convenient to find getopts in the process, and can handle the parameters and parameter values of user input very well.Getopts is used to process user input parameters, with examples of how to use:While GETOPTS:A:B:CDEFG opt; DoCase $opts ina) do sth;......CDE) do another;EsacDoneSeveral important variables:Optind:getopts uses Optind as an index to handle the next pa

[Shell] before using getopts in a function. bashrc has written a function that uses getopts, but it is strange that after this function is called once, the parameter cannot be parsed again and then queried, the OPTIND variable is detected. The original code is as follows: www.2cto. c... [shell] before using getopts in a function. bashrc has written a function tha

In writing shell scripts, we often have to deal with some input parameters, it is more convenient to find getopts in the process, and can handle the parameters and parameter values of user input very well.Getopts is used to process user input parameters, with examples of how to use: while GETOPTS:A:B:CDEFG opt; Do case $opts in a) do sth; .... cde) do another; Esacdone Several important variables: Optind:Getopts uses Optind as an index to handle the n

Shell scripts or function-passed arguments, you can access positional variables to use the values of the parameters. However, in the case of complex parameters, it is best to use getopts processing, which handles the command line options and parameters.Syntax format:Getopts option_string argsIf the script.sh parameter is-f filename-e editor-p Cat, that is./script.sh-f filename-e editor-p CatThe options and parameters can be judged as follows:While

Transferred from: http://yejinxin.github.io/parse-shell-options-with-getopts-command/Standard UNIX commands generally offer a number of options, with the user providing specific options and parameters, in the form of a command line, as follows:command -options parameters filenameGetopts is a shell built-in command that helps us to handle command-line options so that our scripts can be consistent with UNIX commands. The usage format for

#!/bin/bashwhile getopts I:VH Namedo case $name in i) Opt=1 echo $OPTARG;; V) opt=2 Echo 2;; h) opt=3 echo 3;; *) echo "Invalid arg-$OPTARG";; EsacdoneThe getopts is used in the following form: getopts option_string variableGetopts There are two parameters, the first is the-I option, and the second parameter is a