Use isatty: #include <stdio.h> #include <io.h> … if (isatty(fileno(stdin))) printf( “stdin is a terminal\n” ); else printf( “stdin is a file or a pipe\n”); (On windows they’re prefixed with underscores: _isatty, _fileno)
The multiprocessing library provides listeners and clients that wrap sockets and allow you to pass arbitrary python objects. Your server could listen to receive python objects: from multiprocessing.connection import Listener address = (‘localhost’, 6000) # family is deduced to be ‘AF_INET’ listener = Listener(address, authkey=b’secret password’) conn = listener.accept() print ‘connection accepted from’, listener.last_accepted while … Read more
Use IFS= read var << EOF $(foo) EOF You can trick read into accepting from a pipe like this: echo “hello world” | { read test; echo test=$test; } or even write a function like this: read_from_pipe() { read “$@” <&0; } But there’s no point – your variable assignments may not last! A pipeline … Read more
you can try stdbuf $ stdbuf –output=L ./a | tee output.txt (big) part of the man page: -i, –input=MODE adjust standard input stream buffering -o, –output=MODE adjust standard output stream buffering -e, –error=MODE adjust standard error stream buffering If MODE is ‘L’ the corresponding stream will be line buffered. This option is invalid with standard … Read more
The correct notation for Process Substitution is: while read i; do echo $i; done < <(echo “$FILECONTENT”) The last value of i assigned in the loop is then available when the loop terminates. An alternative is: echo $FILECONTENT | { while read i; do echo $i; done …do other things using $i here… } The … Read more
A Unix pipe connects the STDOUT (standard output) file descriptor of the first process to the STDIN (standard input) of the second. What happens then is that when the first process writes to its STDOUT, that output can be immediately read (from STDIN) by the second process. Using multiple pipes is no different than using … Read more
You can’t use Template expression operators(pipe, save navigator) within template statement: (ngModelChange)=”Template statements” (ngModelChange)=”item.value | useMyPipeToFormatThatValue=$event” https://angular.io/guide/template-syntax#template-statements Like template expressions, template statements use a language that looks like JavaScript. The template statement parser differs from the template expression parser and specifically supports both basic assignment (=) and chaining expressions (with ; or ,). However, certain … Read more
A regular pipe can only connect two related processes. It is created by a process and will vanish when the last process closes it. A named pipe, also called a FIFO for its behavior, can be used to connect two unrelated processes and exists independently of the processes; meaning it can exist even if no … Read more
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 on MSDN.
Aha! The script command does what we want… script –return –quiet -c “[executable string]” /dev/null Does the trick! Usage: script [options] [file] Make a typescript of a terminal session. Options: -a, –append append the output -c, –command <command> run command rather than interactive shell -e, –return return exit code of the child process -f, –flush … Read more