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Quick-and-dirty way to ensure only one instance of a shell script is running at a time
...pidfile:
LOCKFILE=/tmp/lock.txt
if [ -e ${LOCKFILE} ] && kill -0 `cat ${LOCKFILE}`; then
echo "already running"
exit
fi
# make sure the lockfile is removed when we exit and then claim it
trap "rm -f ${LOCKFILE}; exit" INT TERM EXIT
echo $$ > ${LOCKFILE}
# do stuff
sleep 1000
r...
Foreign keys in mongo?
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UPD. I'am using PHP as a programming language, how can I use mongoid, if it is written in Ruby?
– Mark Pegasov
Jun 13 '11 at 17:54
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How to get root access on Android emulator?
...an find su and superuser here : http://forum.xda-developers.com/showthread.php?t=682828.
You need to run these commands each time you launch the emulator. You can write a script that launch the emulator and root it.
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How to change the author and committer name and e-mail of multiple commits in Git?
..._NAME"
export GIT_AUTHOR_EMAIL="$CORRECT_EMAIL"
fi
' --tag-name-filter cat -- --branches --tags
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Multiple commands in gdb separated by some sort of delimiter ';'?
..."s")) ; print(gdb.execute("bt"))
It's possible to wrap this up into a dedicated command, here called "cmds", backed by a python definition.
Here's an example .gdbinit extended with a function to run multiple commands.
# multiple commands
python
from __future__ import print_function
import gdb
c...
MIN and MAX in C
... @caf: wouldn't that require that the preprocessor have a more complicated knowledge of C syntax?
– dreamlax
Aug 9 '10 at 5:34
3
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How to commit changes to a new branch
...ad of git checkout your-new-branch ?
– Schrodinger's'Cat
Mar 14 '15 at 1:21
1
how about if I alre...
console.writeline and System.out.println
...err/.in and System.console():
System.console() returns null if your application is not run in a terminal (though you can handle this in your application)
System.console() provides methods for reading password without echoing characters
System.out and System.err use the default platform encoding, w...
Write a program to find 100 largest numbers out of an array of 1 billion numbers
...
Very good points. Nobody else has asked or indicated anything about the distribution of those numbers - it could make all the difference in how to approach the problem.
– NealB
Oct 8 '13 at 19:29
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Is GridFS fast and reliable enough for production?
... since it's up and running. The resize and store stuff is done by a simple php script... but for sure, a python script, or something like java could be faster.
Current data size : 11.23g
Current storage size : 12.5g
Indices : 5
Index size : 849.65m
About the reliability : This is very reliable....