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

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84 views

Log both stdin and stdout of program

What I want though is to run a program and log both the stdin and stdout, but I want the stdin to be supplied from a file. I thought script log.txt < input.txt would work, but it does not, because ...
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2answers
49 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
112 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
630 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 ...
2
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1answer
98 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 ...
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1answer
108 views

Why doesn't this piped script work?

#!/bin/bash rm out mkfifo out nc -l 8080 < out | while read line do echo hello > out echo $line done If I browse to the IP of the machine this script is running on (using port ...
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1answer
43 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
107 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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1answer
33 views

append file with history line number values

Is there a way to append my_computer.sh with the command on line 330 by only referencing the line number? or with the fewest keystrokes possible? 326 pip install -U pip 327 man pip 328 cat ...
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1answer
110 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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1answer
182 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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0answers
41 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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0answers
35 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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0answers
143 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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0answers
86 views

Sed regex printing into a file.txt

I'm connected to a MQTT stream, and I filter out the data by entering : mosquitto_sub -d -t +/# 2>&1 | sed -n "/PUBLISH/{s|.*\('.*',\).*|\1$(date),|;N;s/\n//;p}" into the Ubuntu terminal. ...
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0answers
17 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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0answers
53 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
52 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
174 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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0answers
80 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 ...
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321 views

start-stop-daemon doesn't stop programs which redirect stdout/stderr

I just discovered, that start-stop-daemon doesn't work well with programs redirecting their stdout/stderr: # cat /root/_/1.sh #!/usr/bin/env bash set -eu cmd="~yuri/_/${2:-1}.sh" if [ "${3:-}" = ...