Hi,
Your problem is the pipe ( '|' ) that create another process to execute your filter.
In bash, you can change your syntax like this (but not posix) :
Regards.
This User Gave Thanks to disedorgue For This Post:
I need a way to build variable in this manner:
variable_$i
Inside a for loop i need to create it.
where i goes from 1 to 30..
and then i need to print them on screen with echo $variable_$i
which is the best way to do this? (6 Replies)
In a bash script I've set a variable that is the directory name of where an executable lives.
the_dir=`dirname $which myscript`
which equates to something like "/path/to/dir/bin"
I need to cut that down to remove the "bin" so I now have "/path/to/dir/".
This sounds easy but as a... (2 Replies)
Hello All,
How to concatenate a string to a variable in a script
I'm having a file which is consisting of data and i need to extract the first line of the file and append it to a string.
/tmp/samp.list containg 60000
I like to concatenate it with a string (SS_)
grep -w SS_$(head -1... (1 Reply)
This may be a stupid question, but was wondering if it is possible to make a variable local to a particular script and invisible to an external script that may source the script where it is defined? Thanks as always (2 Replies)
Hi ,I am trying to assign string to variable ,but it doesn't work
Also could you show me different ways to use grep,(I am trying to get the first,second and first column form file,and I am counting the chars)
let name=`grep "$id" product | cut -c6-20` (25 Replies)
Hello,
Why is this not working in a script?
files="test.fsa"
echo $files
for file in $files
do
if
then
echo "$file does not exist."
fi
run a command
done
I get an error saying (3 Replies)
I have a file with
<suit:run date="Trump Tue 06/19/2012 11:41 AM EDT" machine="garg-ln" build="19921" level="beta" release="6.1.5" os="Linux">
Need to find word "build" then
extract build number, which is 19921 also
release number, which is 6.1.5 then
concatenate them to one variable as... (6 Replies)
Hi,
I've been stuck for several days on this. Using grep on a command line, I can use quotes, eg...
grep 'pattern of several words' filename
I want to do this in my bash script. In my script I have captured the several command line arguments (eg arg1 arg2) into a variable:
variable=$@
I... (2 Replies)
I'm trying to write a basic bash script that takes input you give (what directory, if any, what name, if any ....) and passes the information to find.
I'm trying to just create a string with all variables and then pass it to find. So far I have this extremely simple:
#!/bin/bash -f
... (2 Replies)
Discussion started by: Starting_Leaf
2 Replies
LEARN ABOUT DEBIAN
filter_create_fd
filter_create_fd(3) util/filter.h filter_create_fd(3)NAME
filter_create_fd - Create a sub process and return the requested pipes
SYNOPSIS
#include <util/filter.h>
NEOERR *filter_create_fd(const char *cmd, int *fdin, int *fdout, int *fderr,
pid_t *pid);
ARGUMENTS
cmd -> the sub command to execute. Will be executed with
/bin/sh -c
fdin -> pointer to return the stdin pipe, or NULL if you don't
want the stdin pipe
fdout -> pointer to return the stdout pipe, or NULL if you don't
want the stdout pipe
fderr -> pointer to return the stderr pipe, or NULL if you don't
want the stderr pipe
DESCRIPTION
filter_create_fd and filter_create_fp are what popen
been: a mechanism to create sub processes and have pipes to all their input/output. The concept was taken from mutt, though python has
something similar with popen3/popen4. You control which pipes the function returns by the fdin/fdout/fderr arguments. A NULL value means
"don't create a pipe", a pointer to an int will cause the pipes to be created and the value of the file descriptor stored in the int. You
will have to close(2) the file descriptors yourself.
RETURN VALUE
fdin -> the stdin file descriptor of the sub process
fdout -> the stdout file descriptor of the sub process
fderr -> the stderr file descriptor of the sub process
pid -> the pid of the sub process
SEE ALSO filter_wait(3), filter_create_fp(3), filter_create_fd
ClearSilver 12 July 2007 filter_create_fd(3)