0
votes
0answers
13 views

pipe rrd to a new directory

I am chrooted and running out of drive space, so I mounted back to the host drive which has plenty of space but cannot seem to pipe the outputted data to my empty drive [root@localhost rra]# ls ...
-1
votes
3answers
77 views

Can't pipe echo to netcat?

I have the following command: echo 'HTTP/1.1 200 OK\r\n' | nc -l -p 8000 -c and when I curl localhost:8000 I am not seeing HTTP/1.1 200 .. being printed. I am on mac os x with netcat 0.7.1 Any ...
0
votes
2answers
273 views

Netcat output pipe, json parsing

What I want is this: netcat to the server, which streams json formatted loglines. pipe the output of nc to "something" that will format the json as plaintext, in a customizable format (thinking ...
0
votes
1answer
835 views

reading stdin in shell

#!/bin/sh #myVar=`date`#case 1 #myVar=`cat /dev/stdin`#case 2 myVar=($(< /dev/stdin)) #case 3 echo $myVar exit 2 case 1 works case 2 and 3 don't work. When I test with either 2 or 3; there is no ...
0
votes
2answers
223 views

Skipping a “Press certain key to continue” in a bash script

I'm installing RVM for Ruby with the following command: curl -L https://get.rvm.io | sudo su myuser -c "bash -s stable --rails" I specifically need it to be installed under that user - and it will ...
3
votes
6answers
982 views

Pass a pipe to a command that expects a filename

Say I have a command foo which takes a filename argument: foo myfile.txt. Annoyingly, foo doesn't read from standard input. Instead of an actual file, I'd like to pass it the result of another command ...
17
votes
1answer
1k views

Shell command slow when using pipe, fast with intermediate file

Does anyone understand this huge difference in processing time, when using an intermediate file, or when using a pipe? I'm converting tiff to pdf using standard tools on a fresh debian squeeze server. ...
2
votes
2answers
2k views

Why is this tee losing stdout?

Simple script: #!/bin/bash remote_ssh_account="depesz@localhost" directory_to_tar=pgdata exec nice tar cf - "$directory_to_tar" | \ tee >( md5sum - | \ ssh ...
1
vote
3answers
138 views

Why is ``head`` hanging and not terminating?

I have a shell script that has to find the newest file on a remote host. I have this bit: ssh -q $HOSTNAME -t ls -t -1 /path/to/somewhere/ | head -n 1 It prints the first line, then waits and ...
4
votes
5answers
716 views

Bash: Execute piped lines from stdin

I haven't found a solution to this after some searching. I think the search terms are just too general. I'd like to know how to execute a number of lines (at the bash prompt) which are generated by ...
2
votes
2answers
567 views

Bash Parallelization of CPU-intensive processes

tee forwards its stdin to every single file specified, while pee does the same, but for pipes. These programs send every single line of their stdin to each and every file/pipe specified. However, I ...
0
votes
1answer
132 views

How to display results without two first lines

When I run some bash command it returns 2 .. n lines of text (n is different each time, may contain blank lines). How to filter the output to display the result skipping lines 1 and 2? e.g. $ ...
1
vote
1answer
682 views

Non-blocking bash redirection

Does anyone know how to redirect the output of a program, running from a bash script, to a named pipe IN NON BLOCKING MODE (having 'O_NONBLOCK' flag set)?
0
votes
3answers
2k views

Count number of bytes piped from one process to another

I'm running a shell script that pipes data from one process to another process_a | process_b Does anyone know a way to find out how many bytes were passed between the two programs? The only ...
0
votes
3answers
1k views

Bash piping answer in Ubuntu

In a bash script, I want to know know how to pipe in answers like for example: ssh -l username -i /home/ubuntu/.ssh/id host.com < yes The ssh connection would ask if I would like to continue the ...
2
votes
7answers
2k views

Running script in background without sticking to shell

i want to run a shell script remotely via ssh and the ssh shell should end when the script ends. The script itself runs another script whose output is piped to a log file. Example: I run the script ...
13
votes
5answers
15k views

How do I pipe a downloaded file to standard output in bash?

How is it possible to pipe out wget's downloaded file? If not what alternatives should I use? UPD: Thanks all for your answers, I managed to tune my downloader (curl) to send files to stout. However ...
5
votes
3answers
2k views

Bash command for regular expression substitution

What bash command can be used for regex substitution on a pipe? cat foo.txt | someprogram