You want: dir > a.txt 2>&1 The syntax 2>&1 will redirect 2 (stderr) to 1 (stdout). You can also hide messages by redirecting to NUL. More explanation and examples are on the Microsoft documentation page Redirecting error messages from Command Prompt: STDERR/STDOUT.
You can do this. ls | zip test.zip -@ this is done from the notion that i have 3 files in the dir. -rw-rw-r– 1 xxx domain users 6 Jan 7 11:41 test1.txt -rw-rw-r– 1 xxx domain users 6 Jan 7 11:41 test2.txt -rw-rw-r– 1 xxx domain users 6 Jan 7 11:41 test3.txt and the … Read more
This is a reasonably common, but not universal, Un*x convention. (It is mentioned in the POSIX specification and so most non-Linux Unices will support it as well.) The important detail here is that the kubectl … -f option expects a filename. If you have a file named x.yaml, a more direct way to write what … Read more
Java 9 Since Java 9 one can use this method from InputStream: public long transferTo(OutputStream out) throws IOException Pre Java 9 A one-liner from apache commons: IOUtils.copy(inputStream, outputStream); Documentation here. There are multiple copy methods with different parameters. It is also possible to specify the buffer size.
ffmpeg has a special pipe flag that instructs the program to consume stdin. note that almost always the input format needs to be defined explicitly. example (output is in PCM signed 16-bit little-endian format): cat file.mp3 | ffmpeg -f mp3 -i pipe: -c:a pcm_s16le -f s16le pipe: pipe docs are here supported audio types are … Read more
I decided to write a slightly more detailed explanation. The “magic” here lies in the operating system. Both programs do start up at roughly the same time, and run at the same time (the operating system assigns them slices of time on the processor to run) as every other simultaneously running process on your computer … Read more
In terms of syntactic grouping, > and < have higher precedence; that is, these two commands are equivalent: sort < names | head ( sort < names ) | head as are these two: ls | sort > out.txt ls | ( sort > out.txt ) But in terms of sequential ordering, | is performed … Read more
I think you want to instantiate two separate Popen objects here, one for ‘ls’ and the other for ‘sed’. You’ll want to pass the first Popen object’s stdout attribute as the stdin argument to the 2nd Popen object. Example: p1 = subprocess.Popen(‘ls …’, stdout=subprocess.PIPE) p2 = subprocess.Popen(‘sed …’, stdin=p1.stdout, stdout=subprocess.PIPE) print p2.communicate() You can keep … Read more
cat /etc/passwd -n | grep `whoami` | cut -f1 Surrounding a command in ` marks makes it execute the command and send the output into the command it’s wrapped in.
This is often works well enough import os, sys if os.isatty(sys.stdout.fileno()): …