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What linux shell command returns a part of a string? [duplicate]
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If you are looking for a shell utility to do something like that, you can use the cut command.
To take your example, try:
echo "abcdefg" | cut -c3-5
which yields
cde
Where -cN-M tells the cut command to return columns ...
Is Tomcat running?
Interested to know how people usually check to see if Tomcat is running on a Unix environment.
17 Answers
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The necessity of hiding the salt for a hash
...ser name or phone number to salt the hash. Essentially something that is different for each user but is readily available to us. The other product randomly generates a salt for each user and changes each time the user changes the password. The salt is then encrypted in the database.
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In Flux architecture, how do you manage Store lifecycle?
...not need to happen, and developers should strive to avoid this complexity, if possible. But the singleton Dispatcher is ready to handle it when the time comes.
Stores are singletons as well. They should remain as independent and decoupled as possible -- a self-contained universe that one can quer...
How to specify a multi-line shell variable?
... Note that read will have an exit code of 1 in this situation; if that matters (you are running with set -e, for example), you'll want add a || true at the end of the first line.
– chepner
Mar 15 '13 at 12:53
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What does value & 0xff do in Java?
...on something like this is necessary is that byte is a signed type in Java. If you just wrote:
int result = value;
then result would end up with the value ff ff ff fe instead of 00 00 00 fe. A further subtlety is that the & is defined to operate only on int values1, so what happens is:
value...
Font Awesome not working, icons showing as squares
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According to the documentation (step 3), you need to modify the supplied CSS file to point to the font location on your site.
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How to open a file using the open with statement
... Read a list of names from a file line by line into an output file.
If a line begins with a particular name, insert a string of text
after the name before appending the line to the output file.
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with open(newfile, 'w') as outfile, open(oldfile, 'r', encoding='utf-8') as infile...
Linux command: How to 'find' only text files?
...an change the -print to a -print0 for piping into an xargs -0 or something if you are concerned about spaces (thanks for the tip, @lucas.werkmeister!)
Also the first dot is only necessary for certain BSD versions of find such as on OS X, but it doesn't hurt anything just having it there all the tim...
Batch file. Delete all files and folders in a directory
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Note: If you want to bypass "Are you sure you want to delete..." prompt youll need to add /F Q flags: del . /F /Q
– Rhyuk
Apr 22 '13 at 20:41
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