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Shell equality operators (=, ==, -eq)
...eq foo ]; echo "$?" # wrong
-bash: [: foo: integer expression expected
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(Side note: Quote those variable expansions! Do not leave out the double quotes above.)
If you're writing a #!/bin/bash script then I recommend using [[ instead. The doubled form has more features, more natural syntax, a...
Java HashMap performance optimization / alternative
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25 Answers
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Delete specific line number(s) from a text file using sed?
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If you want to delete lines 5 through 10 and 12:
sed -e '5,10d;12d' file
This will print the results to the screen. If you want to save the results to the same file:
sed -i.bak -e '5,10d;12d' file
This will back the file up to file.bak, and delete the given lines.
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When to encode space to plus (+) or %20?
...ometimes the spaces get URL encoded to the + sign, some other times to %20 . What is the difference and why should this happen?
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How can I make a JUnit Test wait?
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How about Thread.sleep(2000); ? :)
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Unix shell script to truncate a large file
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edited Oct 1 '19 at 17:32
André Chalella
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curl: (60) SSL certificate problem: unable to get local issuer certificate
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Set custom attribute using JavaScript
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Use the setAttribute method:
document.getElementById('item1').setAttribute('data', "icon: 'ba...