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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...
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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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...
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
...
Bypass confirmation prompt for pip uninstall
...ackage1 package2 package3
or from file
pip uninstall -y -r requirements.txt
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C# Stream流使用总结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...盘上的文件中读取内容：
FileStream file = File.Open(@"F:\file.txt", FileMode.Open); //初始化文件流
byte[] array = new byte[file.Length];//初始化字节数组
file.Read(array, 0, array.Length);//读取流中数据把它写到字节数组中
file.Close();//关闭流
string str...
Convert .pem to .crt and .key
...bit of data to encrypt:
Example file :
echo 'too many secrets' > file.txt
You now have some data in file.txt, lets encrypt it using OpenSSL and
the public key:
openssl rsautl -encrypt -inkey public.pem -pubin -in file.txt -out file.ssl
This creates an encrypted version of file.txt calling it...