The pipe tag has no wiki summary.
0
votes
1answer
22 views
how to redirect output of command line execution to more than one file according to weight of output
Currently I'm using an awk line to filter a set of files according to certain criteria.
How can I redirect the result output to more than one file if the result, for example if the file that would ...
1
vote
1answer
50 views
How to give and pass input between separate programs?
There's so many individual, useful programs out there who's source code isn't available, some of which would integrate beautifully with each other! The only problem is I don't know how to enable ...
0
votes
2answers
45 views
less emulate a TTY to preserve piped color output
When you pipe something through less, the program usually discards color codes because it's not outputting to a TTY. So you have to add --color=always to the options for it to work.
ls -l ...
0
votes
2answers
63 views
How to pipe awk output (with periodic, continuous input) to output file?
I am trying to write a command that pipes the continuous output of a free command (run every second) to an awk command that parses a specific value (available free memory) and outputs this to a file ...
1
vote
0answers
57 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:
...
2
votes
2answers
36 views
What's the best command to use to change a timestamp to readable date when 'tail -f'-ing a log file?
I have a program which logs like this:
1324218770.7644 INFO etc
What's the best Linux shell program to pipe that through to change the timestamps to a human readable format like Sun 18 Dec 2011 ...
2
votes
1answer
48 views
how to convert a script using pipelines to named pipes
I have a bash script that is using anonymous pipes to achieve:
grabbing video from dv capture device
writing to a file (using tee)
piping it to ffmpeg2theora (converting to ogv/theora video)
writing ...
1
vote
1answer
28 views
How can I view the full exception thrown by a script in the shell?
When I'm running my ruby script, I'm getting an exception. However, since I'm running Ubuntu in VMware Fusion, I can't resize my terminal window so I can't see the whole excecption.
How can I view ...
0
votes
4answers
149 views
How come piping yes to a file doesn't work?
I tried doing this:
yes > yes.txt
Afterwards, yes.txt is created but is completely empty.
0
votes
1answer
47 views
Unix pipe: find | ln -s
I'm trying to symlink some php files using the following command:
find `pwd` -name "*.php" | ln -s * /home/frankv/www/bietroboter.de/symlinks
However, all the symlinks are broken because the little ...
0
votes
2answers
70 views
How can I curl the output of another command
I want to pass curl the output from awk
./jspider.sh http://www.mypage.com | grep 'resource' | awk '{print $4}' | curl OUTPUT_FROM_AWK | grep myString
How can I achieve this?!
1
vote
1answer
66 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 ...
0
votes
0answers
17 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 ...
1
vote
1answer
38 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. ...
0
votes
1answer
35 views
How to find the last match of a string in a bunch of files
I have a bunch of files, I'd like to find the last match of a string in each of them.
grep text *.file gives me all the matches not the last ones.
ls *.file | xargs grep text | tail -n 1 gives me ...
0
votes
0answers
68 views
Use pv to monitor tar over ssh?
I prefer to use tar over ssh as opposed to scp for several reasons, e.g.
tar -czf - file1 file2 ... | ssh host "cd ~/destination && tar -xzf -"
However, I sometimes miss the scp progress ...
0
votes
1answer
45 views
Preserve colors while piping to tee
ls -l --color=auto | tee output.log
Without pipe/tee it's colored. How can I make it so that it stays colored while using tee (can be colored only on the screen, I don't care about colors in logs).
0
votes
2answers
75 views
File name with spaces piped to two xargs commands
I have a directory and many more subdirectories like the following -
file with spaces.txt
filewithsuperlonglines.txt
ordinaryfile.txt
binaryfile.bin
The command -
find . -type f -print0 | ...
0
votes
1answer
84 views
“find | grep | awk” fails miserabily
I'm scanning for all shell scripts on my server, and are doing this by the following command:
find / -type f -exec file --mime-type {} \; | grep "text/x-shellscript"
This is working fine, and here ...
5
votes
3answers
192 views
How can I specify command line arguments using pipes in Linux?
I'm a newbie to shell programming and have no idea how to solve this problem.
I just downloaded a file from the Internet to the default directory ~/Downloads. I want to move that file to another ...
0
votes
1answer
44 views
exec command “who”: Broken Pipe && “ps”:bad namelist
I typed "who" under Freebsd4.5, the information showed as below:
stdout: Broken pipe
......
but showed "test ttyp0 Sep 20 20:39 (192.X.X.8)"last line.
and exec command ps, it returns ...
2
votes
0answers
89 views
Notepad++, Run command and open output in new tab
Is there any way to execute a command from notepad++ and have the results piped back into the program in a new tab?
0
votes
2answers
405 views
Netcat/socat behavior with piping and UDP?
I guess this is close to linux - Netcat stops listening for UDP traffic - Super User, but I thought I'd better ask anyways
As far as versions of netcat I'm using Ubuntu 11.04 and the default netcat ...
0
votes
2answers
108 views
extract a few members from tar archive and pipe through network
edit: I want to extra member01 and member02 and directory blah/
tarball_1.tar.gz contains directory test/ with 20 files. I want to extract only member test/member01 and test/member02 and directory ...
3
votes
3answers
86 views
How can I grep in source files for some text?
At the moment I'm using two commands, I'm sure there must be a better way...
wim@wim-acer:~/ffmpeg$ find . -name "*.h" -print0 | xargs -0 grep -i invalid\ preset
wim@wim-acer:~/ffmpeg$ find . -name ...
8
votes
4answers
259 views
What is the general consensus on “Useless use of cat”?
When I pipe multiple unix commands such as grep, sed, tr etc. I tend to specify the input file that is being processed using cat. So something like cat file | grep ... | awk ... | sed ... .
But ...
2
votes
2answers
423 views
How can I pipe output of ffmpeg to ffplay?
How can I pipe the output of ffmpeg to ffplay?
At the moment I use a workaround in bash :
mkfifo spam
(ffplay spam 2> /dev/null &) ; capture /dev/stdout | ffmpeg -i - spam
0
votes
1answer
328 views
Howto pipe: cp | tar | gzip without creating intermediary files?
Can anyone tell me if it's possible to pipe | this without having to create a physical file anywhere between A and B.tar.gz?
This is what I'm trying to do:
File A
Rename A to B
Tar B.tar
gzip -9 ...
1
vote
1answer
124 views
How long do FIFOs (named pipes) stay “open” for?
For example, I have a script that writes the time to a pipe in /etc/pipe. It writes continuously in a while true loop. How long will the data in the pipe be available for reading? If I only decide to ...
5
votes
2answers
141 views
Passing two arguments to a command using pipes
Usually, we only need to pass one argument:
echo abc | cat
echo abc | cat some_file -
echo abc | cat - some_file
Is there a way to pass two arguments? Something like
{echo abc , echo xyz} | cat
...
2
votes
1answer
137 views
Sniff process communication
On Windows 7, I have two local processes which communicate to let the other execute commands. And I want to know what they are talking.
After some first investigation, it's not over Sockets or ...
1
vote
2answers
241 views
How to feed grep output into scp?
I have a file where each line is a file name. Content of the file:
file1
file2
file3
...
I then run a grep command to get a subset of the list of the file names.
How do I feed the output of the ...
2
votes
1answer
48 views
Which is better: using flags, or pipes?
As with many things in the *nix world, there is more than one way to generate .tar.gz files.
Typically, I use the following:
tar zcf /path/to/dir.tar.gz /path/to/dir
However, I have seen the ...
3
votes
2answers
202 views
Pipes, shell scripts and ulimit
I have a command that I'm calling from code:
execvp('generate', ...)
which is an executable program that my code communicates with via stdin, stdout and stderr. This works fine, not a single ...
8
votes
5answers
556 views
What is a “pipe” and how can it be “broken”?
I've gotten the "broken pipe" error from Xcode one time too many. I'm now curious to know exactly what a pipe is.
What is the concept of a "pipe" and how can it be "broken"?
0
votes
1answer
16 views
Piping results back into the program that generates them
I've got a program that can take input from stdin and produces output in the stdout like this:
cat initial_input.txt | myprogram myindex myoptions - | filter_output > outfile.txt
The program ...
1
vote
2answers
80 views
Pipe screen buffer to another command?
I can't seem to find anything on this so, is there a way to pipe everything from a screen window into another command. I have a server running in screen (not the best idea, but the only way for the ...
4
votes
4answers
129 views
How can I pipe the current contents of less to a new file?
If I've piped the results of a command to less and then decided that I want to save the contents to a file, is this possible?
I've tried setting a mark "a" at the end of the buffer, and then ...
2
votes
1answer
92 views
Is there any way to pipe local output to an SSH server as well?
Is there any way to set up a local process, but have the output also go to a terminal that has SSH'd into my machine?
3
votes
2answers
172 views
Linux: redirecting stdout and stderr
I want to write stdout to a file but also prints stdout and stderr. I tried using tee:
prog | tee stdout.txt
but this causes the printed stderr and stdout to be interleaved incorrectly, i.e. if the ...
4
votes
1answer
214 views
Is backwards redirection the same as a pipe?
In Linux if you type
sort < txtfile
is that the same thing as
cat txtfile | sort
5
votes
1answer
321 views
Is it possible to pipe a list of files to RMDIR on Windows?
I am writing a batch file for the Windows command prompt to delete all directories matching a certain expression.
I am first using DIR to return a plain list of directories matching the expression. I ...
2
votes
1answer
369 views
BASH - Check if unnamed pipe is empty
My problem is, I want a script which reads content from a pipe, checks if it's empty and output it if not, as seen here:
#!/bin/bash
var=$(cat -)
if [ -n "$var" ]
then
echo "$var"
else
echo ...
1
vote
2answers
330 views
Split a large .gz file and gzip each of split file?
I have a large text.gz file (2GB) and I want to split it by line. I tried to use:
zcat text.gz | split -l1000000
However this generated a huge file (around 92GB before I terminated it) and put too ...
6
votes
1answer
359 views
how to escape pipe symbol | in bat scripts?
I need to echo commad usage like this in batch script named command.bat
command.bat on|off
I cant use
echo %0 on|off
I know I can use
echo "%0 on|off"
but it puts quotes along
Is there any ...
2
votes
3answers
249 views
Linux: Limiting data throughput (pipe) in bytes per second?
I was wandering if there is a Linux program that can limit data throughput of a pipe - in actual bytes per second?.
From what I gather, applicable for the purposes would be
bfr, however, it has ...
0
votes
0answers
22 views
How can I close pipes on my Asus 8800GT?
The problem I have is that when I start to play a game, the screen freezes and white dots appear:
When I tested the card in FurMark I noticed that the temperature keeps increasing and the problem ...
5
votes
2answers
277 views
How do you determine the actual command that is piping into you?
Let's say I have a bash script called log.sh. In this script, I want to read in input from a pipe, but I also want to know the command used to pipe input into me. Example:
tail -f ...
0
votes
1answer
150 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 ...
0
votes
1answer
454 views
Windows how to redirect file parameter to stdout? (Windows equivalent of `/dev/stdout`)
Windows console:
Tool A can write binary data to a file, but has no option for telling it to use stdout.
Tool B can read binary data from stdin and process the info in it.
How can I get the output ...
