User input (Bash): verschil tussen versies
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| + | == Direct mode == | ||
| + | Interestingly, <code>man read</code> doesn't exist, but you can use <code>read</code> in direct mode: | ||
| + | |||
| + | <pre> | ||
| + | $ read blub; echo $blub | ||
| + | |||
| + | hallo ← User input | ||
| + | hallo ← Echod back to console | ||
| + | </pre> | ||
| + | |||
| + | == Simple script == | ||
| + | |||
| + | <code>read</code> is probably more relevant in a script than in direct mode: | ||
| + | |||
| + | <pre> | ||
| + | #!/bin/bash | ||
| + | |||
| + | read response | ||
| + | echo "Response: $response | ||
| + | </pre> | ||
| + | |||
| + | When executing this script, there is just a blinking prompt. Input is subsequently echod. | ||
| + | |||
| + | == Including prompt == | ||
| + | |||
| + | <pre> | ||
| + | #!/bin/bash | ||
| + | |||
| + | read -p "Please type something" response | ||
| + | echo "Response: $response | ||
| + | </pre> | ||
| + | |||
| + | The flag <code>-p</code> indentifies the next argument as prompt. Without this flag, an error would occur. | ||
| + | |||
| + | == Including silent prompt == | ||
| + | |||
| + | Nice of asking for e.g., a password: | ||
| + | |||
| + | <pre> | ||
| + | #!/bin/bash | ||
| + | |||
| + | read -ps "Password?" response | ||
| + | </pre> | ||
| + | |||
| + | == read usage == | ||
| + | |||
| + | No man page seems to exit, but sometimes (like through <code>read -help</code>) some help can be get: | ||
| + | |||
| + | <pre> | ||
| + | read: usage: read [-ers] [-a array] [-d delim] [-i text] [-n nchars] [-N nchars] [-p prompt] [-t timeout] [-u fd] [name ...] | ||
| + | </pre> | ||
== Sources == | == Sources == | ||
* https://ryanstutorials.net/bash-scripting-tutorial/bash-input.php | * https://ryanstutorials.net/bash-scripting-tutorial/bash-input.php | ||
Huidige versie van 21 jul 2022 om 12:48
Direct mode
Interestingly, man read doesn't exist, but you can use read in direct mode:
$ read blub; echo $blub hallo ← User input hallo ← Echod back to console
Simple script
read is probably more relevant in a script than in direct mode:
#!/bin/bash read response echo "Response: $response
When executing this script, there is just a blinking prompt. Input is subsequently echod.
Including prompt
#!/bin/bash read -p "Please type something" response echo "Response: $response
The flag -p indentifies the next argument as prompt. Without this flag, an error would occur.
Including silent prompt
Nice of asking for e.g., a password:
#!/bin/bash read -ps "Password?" response
read usage
No man page seems to exit, but sometimes (like through read -help) some help can be get:
read: usage: read [-ers] [-a array] [-d delim] [-i text] [-n nchars] [-N nchars] [-p prompt] [-t timeout] [-u fd] [name ...]