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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 recognize USB devices in Virtualbox running on a Linux host? [closed]
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2 Answers
2
Active
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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...
Cannot change column used in a foreign key constraint
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127
The type and definition of foreign key field and reference must be equal.
This means your forei...
How to disable “Save workspace image?” prompt in R?
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edited Jun 27 '17 at 15:57
jan-glx
3,5592222 silver badges4545 bronze badges
answered Feb...
How can you use optional parameters in C#?
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23 Answers
23
Active
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How to automatically add user account AND password with a Bash script?
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123
You can run the passwd command and send it piped input. So, do something like:
echo thePasswo...
C++ code file extension? .cc vs .cpp [closed]
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community wiki
2 revs, 2 users 67%JaredPar
101
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