io redirection is the process of changing where the output and input of a program originate

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146 views

CSH and all output (with errors) to file

I need save all output from compilation to file. I have many errors "undefined reference" and I want see all of these errors. I try "makeall >& out", but in file "out" aren't any of error "...
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2answers
31 views

operate on different sections of stdin without intermediate file

Is there a simple way to do this with redirection or pipes without creating FILE1? I want to apply process2 to the body of the output of process1, without touching the first and last few lines. ...
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2answers
2k views

How to redirect output of a 'xterm -hold -e' command

I know you can use tee to log output from a command in a terminal, e.g.: df -h | tee ~/log.txt However, how can I do this with a more complex command like this: xterm -hold -e program arg1 arg2 ...
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2answers
291 views

Unix how to loop through directories, send output to another directory with base name of input file

I am an infrequent user of UNIX, I'm sure this will be fairly trivial for any regular user so I appologize for that. I have the following code: for file in /home/sub1/samples/aaa*/*_novoalign.bam ...
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1answer
845 views

KSH styling text based menu using STDERR

Is it possible to format the STDERR in order to have a better looking menu using the select command? I have a simple select select oChoice in $(<tempMenu.menu) ; do case "$oChoice" in ...
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1answer
228 views

Capturing data from a Fluke 1620a via Bash /dev/tcp file descriptor

I am currently trying to develop a script that will connect to a Fluke DewK 1620a Themo-Hygrometer and pull the current temperature and humidity readings from the device. While these devices have a ...
0
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1answer
30 views

Redirect keyboard input to unfocused program

I'm looking for some help with a computing issue. I'm running Openbox 3.5.2 on Raspbian/Pi3 and a single monitor. I want to have one program focused and in fullscreen while the keyboard outputs to ...
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1answer
59 views

Redirect output of: yum repolist all

If you run the command: yum repolist all you will see there are basically four columns of data. repo id, repo name, status, install count. If however your run something like: yum repolist all > ...
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1answer
19 views

GDB - Call second program

I have a program which I want to debug gdb. And I want to call a second program to redirect the output to the first program. How this is done in gdb. I tried it like that: run -2 < $(python ...
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1answer
60 views

Starting job via SSH and detaching from a composite command

I'd like to start a long running script via SSH and immediately return. Afterwards, I want to check the remote host every 5 minutes to see if the job is done. In order to accomplish the first part, I ...
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1answer
87 views

Cron to find exec cp and redirect output with time / date per line?

I try to setup a cron task to run a set of basic shell commands. I need to look to any files created on the last day, then copy to another folder and generate a log stating, line by line, the date ...
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1answer
46 views

Is it ever possible for command redirection to HDD to fail?

I'm using Xubuntu 15.04, and sometimes have this really strange problem, originating from a XeLaTeX run. When using this typesetting system, the following system command is executed: uname -s > &...
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1answer
69 views

need to get the command information over ssh and the input from file

I am writing a script to get the command information of the remote machine usinf while and for loop. PFB the script. But the script ends by giving the single command information only. I have multiple ...
0
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1answer
410 views

Redirect a directory as input to a script and output to a file

I want to use a directory name as a parameter for a pre-made script. Then the output goes into a newly made file in the home directory. It involves pipe/redirection. How do I do that? read dir $dir &...
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1answer
138 views

Prompting when redirecting content of script to remote machine

I have simple script: #!/bin/bash while getopts ":u:" opt; do case $opt in u) USER="${OPTARG}" ;; \?) echo "Unknown flag has been used: -$OPTARG" >&2 exit 1 ...
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37 views

Piping the output of a bash script after redirecting stderr

because of the way my hoster does things I have to use a system for services. This service has a run file which it executes and pipes into a second run file. But I use a (given) python package that ...
2
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0answers
26 views

Trap ctrl c not working as expected

I have a code that looks like this: { trap cleanup SIGHUP SIGINT SIGTERM function executed() { if [ ${1} -ne 0 ] then echo "Failed!" cleanup ...
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0answers
13 views

How to limit/monitor a cgroup process's blkio when process has output redirection

I have some questions on cgroup blkio controller. I want to limit the IOPS on a specific process. This process uses IO redirection to write the stdout contents into a file. I tried to put the ...
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295 views

Recording shell output for interactive commands

While looking into a shell redirection problem, I found a couple of answers that pointed me to the script command. As I understand it, script just records in- and output of the terminal, and allows me ...
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0answers
248 views

extract text to csv file from output of reading multiple files into specific rows

I am trying to write a bash script to generate a csv file from text within multiple pdf documents. I have a script for converting pdf to text, but not for generating the csv file. Each text document ...
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0answers
233 views

Captive portal detection, popup implementation?

Based on hostapd, I m building a captive portal. - My Linux Machine provides a Wifi access. - iPad's and Android clients-tablets connect this Wifi. Generally, any client OS check if a url is ...
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59 views

Inherit IO redirections from a script to another

When I redirect the output of a script within a script, I expect the redirection to be applied to the called script as well as the program called within it. A: ./B 2>> error.log B: ./...
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399 views

Why the output is not written to log from expect script

I am trying to write the output of the netcat command including the command also to a file by logging into remote servers. But it is not writing. What am I missing ? #!/usr/bin/expect -f set user [...
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24 views

Bash Script to start a service on Ubuntu Linux 16.04

Does the following Ubuntu 16.04 bash script command: exec /usr/lib/mono/4.5/mono-service.exe \ /home/frank/Debug/My_Camera_Recorder.exe "$@" >& /dev/null start the My_Camera_Recorder ...
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run command line contains redirection >> inside Guest VM

Another alternative of running ls -l /home for example in Guest VM called myvm ,is to run on the host the following command : vboxmanage --nologo guestcontrol myvm --username root --password xxxx ...
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106 views

Stop stdout log being clipped (by heroku-local)

I run heroku local with the Procfile: web: start-nginx gunicorn -c gunicorn.conf.py app:app start-nginx does some environment setup, and then ends with: { nginx --some-params & $@ ; } the ...
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0answers
92 views

How to enter username and password automatically in jrerun command?

jrerun is a command belongs to IBM Process Manager tool. This command will re-run the failed job. I want to create a script that re-runs automatically if it fails before 1 hour from start time. The ...
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0answers
45 views

writefile() to file descriptor produces output with alignment issue

The command that produces weird output: $ vim -ec 'call writefile(["line1","line2"],"/proc/self/fd/9") | qall!' 9>&1 1>/dev/null 2>&1 line1 line2 $ Same command ...
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76 views

How to rewrite the comand using I/O redirections?

Is there any way to rewrite the following command using only I/O redirections and not pipes ? ls -l | grep User | wc -l | tail -l
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0answers
266 views

how to route traffic on port to ip:port on linux?

I'm trying to route all traffic on port udp 5000 to udp 192.168.0.1:12333 with the following command: $ iptables -t nat -A PREROUTING -p udp -m udp --dport 5000 \ -j DNAT --to 192.168.0.1:12333 ...
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110 views

Why is a here-string command substitution considered as a single line?

I'm experimenting with while read syntax and there is a thing I don't understand. The most basic scenario which reproduces the problem is the following: a bash script a.sh calls another script b.sh ...