11-25-2009
Unless you are using bash the pipe causes the line of code to return the status of tee.
With bash, look up PIPESTATUS examples here:
Internal Variables
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1. Shell Programming and Scripting
can you redirect STDIN with command arguments?
I have tried this approach:
# ./script -option <argument1> <argument2> 0<$2
# $2: ambiguous redirect
Is this possible? (4 Replies)
Discussion started by: prkfriryce
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2. Programming
Hi,
Program A: uses pipe()
I am able to read the stdout of PROGAM B (stdout got through system() command) into PROGRAM A using:
* child
-> dup2(fd, STDOUT_FILENO);
-> execl("/path/PROGRAM B", "PROGRAM B", NULL);
* parent
-> char line;
-> read(fd, line, 100);
Question:... (2 Replies)
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3. Programming
Hi all
I've run into a snag in a program of mine where part of what I entered in at the start of run-time, instead of the current value within printf() is being printed out.
After failing with fflush() and setbuf(), I tried the following approach
void BufferFlusher()
{
int in=0;... (9 Replies)
Discussion started by: JamesGoh
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4. Shell Programming and Scripting
#!/bin/sh
exec 0</dev/null
exec 1>/dev/null
ls -l /proc/self/fd >&2 produces total 0
lr-x------ 1 tyler users 64 Feb 18 10:38 0 -> /proc/7886/fd
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5. Shell Programming and Scripting
Hi,
I am working on a project where I have to generate and execute nasm code on-the-fly. I generate the code in a file program.asm and then execute it.This output is to stdout which i redirect to an output file which i read back to compare results:
system("nasm -f elf program.asm >... (5 Replies)
Discussion started by: doc_cypher
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6. Programming
All,
Ok...so I know I *should* be able to control a process's stdin and stdout from the parent by creating pipes and then dup'ing them in the child. And, this works with all "normal" programs that I've tried. Unfortunately, I want to intercept the stdin/out of the scp application and it seems... (9 Replies)
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7. Programming
Hi,
i am using the below program to read from the standard input or to write to standard out put.
i know that using highlevel functions this can be done better than what i have done here.
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8. UNIX for Dummies Questions & Answers
Hallo,
i have a script like:
if ;then
echo "OK"
else
echo "ERROR $2 is missing"
fi;
if ;then
touch $2
fi;
if ;then
cat $1 | grep xy > $2 (1 Reply)
Discussion started by: eightball
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9. UNIX for Advanced & Expert Users
I want to differentiate the STDOUT and STDERR messages in my terminal .
If a script or command is printing a message in terminal I want to differentiate by colors,
Is it possible ?
Example:
$date
Wed Jul 27 12:36:50 IST 2011
$datee
bash: datee: command not found
$alias ls
alias... (2 Replies)
Discussion started by: ungalnanban
2 Replies
10. Shell Programming and Scripting
Well.. let's say i need to write a pretty simple script.
In my script i have 2 variables which can have value of 0 or 1.
$VERBOSE
$LOG
I need to implement these cases:
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GRC(1) General Commands Manual GRC(1)
NAME
grc - frontend for generic colouriser grcat(1)
SYNOPSIS
grc [options] command [args]
DESCRIPTION
grc will execute command command with optional parameters [args] piping its stdout or stderr into grcat, with apropriate configuration
file.
Configuration file for grc is determined by /etc/grc.conf file.
Format of /etc/grc.conf: each entry consists of 2 lines, between entries there can be any number of empty lines or lines beginning with #
(comments)
First line is regular expression, second line the name of configuration file for grcat.
Configuration file after the first regular expression matching command [args] will be passed to grcat as its configuration file
OPTIONS
--help Show summary of options.
--version
Display version.
-e --stderr
Redirect error output. Unless -s is selected as well, this cancels redirection of standard output via grcat
-s --stdout
Redirect standard output. Used to redirect standard output together with --stderr option.
--colour=x
x is one of on off auto
--colour=on will colourise (default)
--colour=off will just execute command without colourising.
--colour=auto will test if standard output is a tty, and colourise only when it is.
SEE ALSO
grcat(1)
AUTHOR
Written by Radovan Garabik <garabik @ kassiopeia.juls.savba.sk>
GRC(1)