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How can I negate the return-value of a process?
...nd fail | some-other-command fail; echo $?
0
$ ! some-command < succeed.txt; echo $?
1
# Environment variables also work, but must come after the !.
$ ! RESULT=fail some-command; echo $?
0
# A more complex example.
$ if ! some-command < input.txt | grep Success > /dev/null; then echo 'Fai...
Node.js check if file exists
...a minute search try this :
var path = require('path');
path.exists('foo.txt', function(exists) {
if (exists) {
// do something
}
});
// or
if (path.existsSync('foo.txt')) {
// do something
}
For Node.js v0.12.x and higher
Both path.exists and fs.exists have been deprec...
C: Run a System Command and Get Output? [duplicate]
...al program, you can use the OS to help you here.
command > file_output.txt
So your C code would be doing something like
exec("command > file_output.txt");
Then you can use the file_output.txt file.
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Downloading an entire S3 bucket?
... to the current directory.
And will output:
download: s3://mybucket/test.txt to test.txt
download: s3://mybucket/test2.txt to test2.txt
This will download all of your files using a one-way sync. It will not delete any existing files in your current directory unless you specify --delete, and it ...
Run a Java Application as a Service on Linux
...then stores the PID to a file:
nohup java -jar myapplication.jar > log.txt 2> errors.txt < /dev/null &
PID=$!
echo $PID > pid.txt
Then your stop script stop.sh would read the PID from the file and kill the application:
PID=$(cat pid.txt)
kill $PID
Of course I've left out some d...
Cmake doesn't find Boost
...RARYDIR and BOOST_ROOT automatically. Do something like this in CMakeLists.txt:
FIND_PACKAGE(Boost)
IF (Boost_FOUND)
INCLUDE_DIRECTORIES(${Boost_INCLUDE_DIR})
ADD_DEFINITIONS( "-DHAS_BOOST" )
ENDIF()
If boost is not installed in a default location and can, thus, not be found by CMake, you...
Insert a string at a specific index
...y, at the first space character) has to use string slicing/substring:
var txt2 = txt1.slice(0, 3) + "bar" + txt1.slice(3);
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Explaining Python's '__enter__' and '__exit__'
...mponents self object,which I want to expose to user like in with open(abc.txt, 'r') as fin: content = fin.read()
– ViFI
Jul 11 '16 at 10:37
...
Extract file basename without path and extension in bash [duplicate]
...command. Instead, you could use the following commands:
$ s=/the/path/foo.txt
$ echo "${s##*/}"
foo.txt
$ s=${s##*/}
$ echo "${s%.txt}"
foo
$ echo "${s%.*}"
foo
Note that this solution should work in all recent (post 2004) POSIX compliant shells, (e.g. bash, dash, ksh, etc.).
Source: Shell Comma...
Bypass confirmation prompt for pip uninstall
...ackage1 package2 package3
or from file
pip uninstall -y -r requirements.txt
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