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Validating parameters to a Bash script
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#!/bin/sh
die () {
echo >&2 "$@"
exit 1
}
[ "$#" -eq 1 ] || die "1 argument required, $# provided"
echo $1 | grep -E -q '^[0-9]+$' || die "Numeric argument required, $1 provided"
while read dir
do
[ -d "$dir" ] || die "Directory $dir does n...
Convert Base64 string to an image file? [duplicate]
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265
The problem is that data:image/png;base64, is included in the encoded contents. This will resu...
How to detect internet speed in JavaScript?
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298
It's possible to some extent but won't be really accurate, the idea is load image with a known...
How to convert URL parameters to a JavaScript object?
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edited Feb 26 '18 at 16:18
answered Dec 27 '11 at 20:31
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@RequestParam in Spring MVC handling optional parameters
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229
You need to give required = false for name and password request parameters as well. That's bec...
How to handle more than 10 parameters in shell
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2 Answers
2
Active
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Subtract two variables in Bash
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225
You just need a little extra whitespace around the minus sign, and backticks:
COUNT=`expr $FI...
What are some uses of template template parameters?
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205
I think you need to use template template syntax to pass a parameter whose type is a template ...
How to read a file into a variable in shell?
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1120
In cross-platform, lowest-common-denominator sh you use:
#!/bin/sh
value=`cat config.txt`
echo...
How to check for null in Twig?
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522
Depending on what exactly you need:
is null checks whether the value is null:
{% if var is n...