Pipes or named pipesĀ are a feature of the POSIX standard that allow separate processes to communicate with each other without having been designed explicitly to work together.

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Use grep to find files and pipe/open to open them

How can I pipe files from grep to open all matching files? I've tried grep -li "type" * | open, but that does not work.
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69 views

.cmd script output only goes to pipe occasionally

I'm having a problem with a .cmd script only occasionally passing it's output through a pipe. The script is auto generated by npm and it runs jshint using node. Here's the script: :: Created by npm, ...
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1answer
20 views

Pipeing lines to repeat commands

If my grep operation returns a list of ID's like: 12345 84758 49549 .. can I somehow feed/pipe each line to a commandline command's parameter? Like for example with the above result from grep, I'd ...
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1answer
47 views

SoX pipe operations and data loss

When piping operations using SoX, I've noticed that files get shorter than they should: Works fine: sox -n -r 44100 silence.wav trim 0 1 sox --combine sequence silence.wav combined.wav soxi -D ...
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1answer
518 views

How to solve “Broken Pipe” error when using awk with head

I'm getting broken pipe errors from a command that does something like: ls -tr1 /a/path | awk -F '\n' -vpath=/prepend/path/ '{print path$1}' | head -n 50 Essentially I want to list (with absolute ...
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1answer
405 views

pipe from ssh to windows “ssh server 'tail err.log' | tool.exe”

I want to live monitor a logfile generated on a remote linux host with a windows tool. I'm looking for something like: $> ssh remoteserver 'tail -F /var/log/err.log' | tool.exe But on Windows. ...
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1answer
457 views

Add custom time to video frames using ffmpeg

I am using ffmpeg to encode raw pixels data (bgr32) into a video file. Pixels data is being sent from java application to ffmpeg stdin pipe. I am looking for a way to add a timestamp overlay to each ...
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171 views

Why does echo work through pipe but not cat with msmtp?

This works: echo "yada yada" | msmtp my@mail.com but not this: cat yadayada.txt | msmtp my@mail.com which delivers the email with empty content. Why does echo work through pipe but not ...
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108 views

redirect awk information to stdout

I am trying to gather information for CPU use for all the processors in a text file. mpstat -P ALL -u 1 | awk '{print $4}' > cpu.txt && mptat -P ALL -u 1 | awk '{print $4}' | tee cpu.txt ...
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406 views

OS X: log text from serial port

I have a text stream coming in on a USB-RS232 adapter. I want to pipe it to some Unix tools, to a file, whatever. What is the simplest way to do so? Does it really require third-party software? OS X ...
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126 views

pipe unlimited curl stdout into chunked files

I've got an HTTP-endpoint that serves an unlimited stream of events. Now I'd like to record that stream using curl, but splitting the recorded files at the same time - preferably based on the line ...
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902 views

'No such interface supported' when attempting to compress file through 7zip commandline

When I run the 7zip commandline: > echo foo | 7za a arc.7z -sifoo.txt Everything works as expected, but if I try to do: echo foo | 7za a arc.zip -sifoo.txt I get the following: ...
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How to parse pipe with multiple commands independently?

How can I parse output of a single command by multiple commands without truncating at each step? For example ls -al|grep -i something will pass every line that has "something" in it to the next ...
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0answers
35 views

Netcat server output with multiple greps

I'm trying to send some data from my web browser to a txt file on another computer by visiting http://myserver.mydomain.tld:8080/?data=some_data_I_want_to_save. This works fine as a server: echo ...
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0answers
9 views

remove permission spam for find is not working tcsh enviroment

Hello this question is asked a lot like here: However, my environment on (csh or tcsh) seems to add a space but I can't figure out why. for instance, on bash: find /. -user `whoami` 2>/dev/null ...
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35 views

Using pipes on ffmpeg has different behaviour than using files

I am using pipes to provide input and to send out output from FFmpeg The command I use is essentially ffmpeg -i pipe:0 -f flv pipe:1 I am using a Java program that basically provides an input ...
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0answers
34 views

redirect tar notices when used with pipe

I have a remote backup cron script that contains the following line: cat ${list} | xargs tar Jlcf - | ssh -i /root/.ssh/backup \ seron@dummy.net "backup_${DATE}.txz" It gives tar a list of ...
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0answers
61 views

ffmpeg set duration when muxing from fifos to pipe

I'm trying to mux two files (audio and video) coming from fifos and to output the result to a pipe. The input files are one mp4 h264 file and a m4a aac, and the output file should be a matroska ...
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77 views

error with upstart script

Further to my last question, I'm now using logger. I have the following upstart configuration start on runlevel [2345] stop on runlevel [06] respawn pre-start script exec 2>&1 > ...
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78 views

Force FFMPEG to honour timestamp when receiving raw frames

My app interface is recorded with FFMPEG: ffmpeg -f rawvideo -vcodec rawvideo -s,1280x720 -pix_fmt argb -r 15 -i - -c:v libx264 -b:v 1024k result.mp4 All works very well except that the output ...
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109 views

No prompt for password when piping through ssh

i'm trying to use partclone to clone a partition and send the .img on my ssh server.That's what i do : partclone.ext2 -c -d -s /dev/sda1 | ssh -p xxxxx username@serveraddress "cat > backup.img" when ...
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how do you monitor the progress of a command line program?

We have some custom command line programs at our Windows shop. These commands are scheduled to run (from within bat files) at regular intervals using the Task Scheduler. Our tasks pull data from ...
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255 views

mysqldump to local mysql database through ssh

This command: ssh bruchowski@www.example.com 'mysqldump -u bruchowski -p dbname' > mysql -u root dbname Produces this error: mysqldump: Got error: 1045: Access denied for user ...
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53 views

Is there a terminal emulator in windows with slave mode like xterm?

I am writing a CPU emulator and it simulates some peripherals as well. One of these peripherals is UART interface. I want to use a terminal emulator as the slave of my application so that I can ...
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39 views

How to port script with pipes from Linux to Windows?

In relation to the following question, I have produced the following script snippet. .gdbinit: # Open openocd and pipe data throudh stdin/stdout. # Openocd quits after gdb exits. target remote | ...
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604 views

Rendering HTML from a pipe

I would like to be able to generate HTML then pipe it to a program which will render it, something like this: for i in 1 2 3 do for j in a b c do echo "<table ...
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92 views

mutt colorizing piped messages

Viewing messages in mutt are colorized, but piping them through the less pager removes colorization. How do I preserve message colorization? I've tried: | less -R but colorization is stripped ...