ScriptStarter provides a means to generate a nice template of a bash script.
Set ScriptStarter url.
bash-4.2# STARTER_URL=https://raw.githubusercontent.com/xshoji/bash-script-starter/master/ScriptStarter.sh
Display usage.
bash-4.2# ./ScriptStarter.sh -h
ScriptStarter
------------------ author: xshoji
This script generates a template of bash script tool.
Usage:
./ScriptStarter.sh --naming scriptName [ --author author --description Description --description ... --required paramName,sample,description --required ... --optional paramName,sample,description,defaultValue(omittable) --optional ... --flag flagName,description --flag ... --env variableName,sample --env ... --short --keep-starter-parameters --protect-arguments ]
Required:
-n, --naming scriptName : Script name.
Optional:
-a, --author author : Script author.
-d, --description Description : Description of this script. [ example: --description "ScriptStarter's description here." ]
-r, --required paramName,sample,description : Required parameter setting. [ example: --required id,1001,"Primary id here." ]
-o, --optional paramName,sample,description,defaultValue(omittable) : Optional parameter setting. [ example: --option name,xshoji,"User name here.",defaultUser ]
-f, --flag flagName,description : Optional flag setting. [ example: --flag dryRun,"Dry run mode." ]
-e, --env variableName,sample : Required environment variable setting. [ example: --env API_HOST,example.com ]
-s, --short : Enable short parameter. [ example: --short ]
-k, --keep-starter-parameters : Keep parameter details of bash-script-starter in the generated scprit. [ example: --keep-starter-parameters ]
-p, --protect-arguments : Declare argument variables as readonly. [ example: --protect-arguments ]
Helper options:
--help, --debug
bash-4.2#
A sample of generated script here.
Plain script no needs parameter.
-h and --debug options are supported as default.
bash-4.2# curl -sf ${STARTER_URL} |bash -s - -n MyScript -a xshoji > MyScript
bash-4.2# ./MyScript -h
MyScript
------------- author: xshoji
This is MyScript.
Usage:
./MyScript
Helper options:
--help, --debug
bash-4.2# ./MyScript
bash-4.2#
Required parameters are validated.
Missing parameters are displayed as [!].
bash-4.2# curl -sf ${STARTER_URL} |bash -s - -n MyScript -a xshoji -r id,1001 -r name,xshoji > MyScript
bash-4.2# ./MyScript
[!] --id is required.
[!] --name is required.
MyScript
------------- author: xshoji
This is MyScript.
Usage:
./MyScript --id 1001 --name xshoji
Required:
--id 1001 : "1001" means id.
--name xshoji : "xshoji" means name.
Helper options:
--help, --debug
bash-4.2#
Optional parameters will be not validated.
These optional parameters are initialised with a default value.
bash-4.2# curl -sf ${STARTER_URL} |bash -s - -n MyScript -a xshoji -o id,1001 -o name,xshoji,"A user name.","guest" > MyScript
bash-4.2# ./MyScript -h
MyScript
------------- author: xshoji
This is MyScript.
Usage:
./MyScript [ --id 1001 --name xshoji ]
Optional:
--id 1001 : "1001" means id.
--name xshoji : A user name. [ default: guest ]
Helper options:
--help, --debug
bash-4.2# ./MyScript
[ Optional parameters ]
id: 1001
name: guest
bash-4.2# ./MyScript --name myname
[ Optional parameters ]
id:
name: myname
bash-4.2#
Flags will be not validated.
These flags are set to "true" string when enabled (default: empty string).
bash-4.2# curl -sf ${STARTER_URL} |bash -s - -n MyScript -a xshoji -f strict -f dryRun > MyScript
bash-4.2# ./MyScript -h
MyScript
------------- author: xshoji
This is MyScript.
Usage:
./MyScript [ --strict --dryRun ]
Optional:
--strict : Enable strict flag.
--dryRun : Enable dryRun flag.
Helper options:
--help, --debug
bash-4.2# ./MyScript --strict
[ Optional parameters ]
strict: true
dryRun: false
bash-4.2# ./MyScript --dryRun
[ Optional parameters ]
strict: false
dryRun: true
bash-4.2#
You can check which environment variables be should be exported.
Missing environment variables are displayed as [!].
bash-4.2# curl -sf ${STARTER_URL} |bash -s - -n MyScript -a xshoji -e ENV_VAR_A,1001 -e ENV_VAR_B,xshoji > MyScript
bash-4.2# ./MyScript
[!] export ENV_VAR_A=1001 is required.
[!] export ENV_VAR_B=xshoji is required.
MyScript
------------- author: xshoji
This is MyScript.
Usage:
./MyScript
Environment variables:
export ENV_VAR_A=1001
export ENV_VAR_B=xshoji
Helper options:
--help, --debug
bash-4.2# export ENV_VAR_A=1001; export ENV_VAR_B=xshoji
bash-4.2# ./MyScript
[ Environment variables ]
ENV_VAR_A: 1001
ENV_VAR_B: xshoji
You can specify any parameters as a short name parameter.
The -s, --short option enables short parameters.
bash-4.2# curl -sf ${STARTER_URL} |bash -s - -n MyScript -a xshoji -r id,1001 -o name,xshoji -f dryRun -s > MyScript
bash-4.2# ./MyScript
[!] --id is required.
MyScript
------------- author: xshoji
This is MyScript.
Usage:
./MyScript --id 1001 [ --name xshoji --dryRun ]
Required:
-i, --id 1001 : "1001" means id.
Optional:
-n, --name xshoji : "xshoji" means name.
-d, --dryRun : Enable dryRun flag.
Helper options:
--help, --debug
bash-4.2# ./MyScript -i 1001 -n myname -d
[ Required parameters ]
id: 1001
[ Optional parameters ]
name: myname
dryRun: true
-p, --protect-arguments option generates readonly declaring.
bash-4.2# curl -sf ${STARTER_URL} |bash -s - -n MyScript -r id,1001 -o name,xshoji -s -p > MyScript
bash-4.2# cat MyScript
...
# To readonly variables
readonly ID
readonly NAME
...
Your script should be writen following "Main".
If you would like to alter script parameters, you re-generate a script template by ScriptStarter. Then, lines from top to "Main" on generated template only have to be copied and pasted to your script.