11-29-2012
A FIFO blocks until both ends have been opened. You can't do it one at a time; if you open the read-end first it will wait for the writer, if you open the write-end first it will wait for the reader.
You'll have to put one of the processes in the background first before you can open the other end.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
When running top, I notice a bit more I/O wait time than usual. Is there a tool or piece of software out there that can me help evaluate the performance of these operations on my machine? Thanks! (5 Replies)
Discussion started by: unavb
5 Replies
2. Shell Programming and Scripting
Hello, I have been trying to figure out why the wait isnt waiting for the sleep process to complete till now and have found out that since sleep runs as different process and not a child process the wait isnt waiting.
script:
cat test|while read i
do
echo $i
sleep 30 &
done
wait
ps... (4 Replies)
Discussion started by: wannalearn
4 Replies
3. Shell Programming and Scripting
I have tracefile of three nodes (0 , 1 and 2 ) as follows:
+ 0.02 0 1 tcp 40 ------- 1 0.0 2.0 0 0
- 0.02 0 1 tcp 40 ------- 1 0.0 2.0 0 0
+ 0.02 2 1 tcp 40 ------- 2 2.1 0.1 0 1
- 0.02 2 1 tcp 40 ------- 2 2.1 0.1 0 1
r 0.025032 0 1 tcp 40 ------- 1 0.0 2.0 0 0
+ 0.025032 1 2 tcp 40 -------... (11 Replies)
Discussion started by: ASAADAOUI
11 Replies
4. Shell Programming and Scripting
Hi,
Here is my code as below:
test.ksh:
=======
#!/bin/ksh
option="${1}"
while
do
case $1 in
-f) FILE="${2}"
echo "File name is $FILE"
;;
-d) DIR="${2}"
echo "Dir name is $DIR"
;;
-*)
echo "`basename ${0}`:usage: | " (5 Replies)
Discussion started by: zaq1xsw2
5 Replies
5. Shell Programming and Scripting
I am getting the following error when I am running a script in ksh when trying to execute an if statement comparing two numerical values
tstmb.sh: 1.5321e+08: 0403-057 Syntax error
Below is my code snippet.
#!/bin/ksh
set -x
TODAY=$(date +%y%m%d)
for file in $(ls -rt *.log | tail... (11 Replies)
Discussion started by: kiran1112
11 Replies
6. Shell Programming and Scripting
The code at the bottom is a simplified example of what we have.
If I use the following:
&& echo "echo failed"
$? returns 1
When I use
if ; then echo "echo failed" ; fi
$? returns 0
Does anyone know what's wrong with this?
Using AIX 6.1 and KSH
for NUM in 1 2 3
do
... (5 Replies)
Discussion started by: jfxdavies
5 Replies
7. Shell Programming and Scripting
I'm looking for some help in figuring why my little bit of code will not process any entries other then the first one in my list.
while read line ;do
hostname=${line//\"}
a=`ssh user@$hostname uptime;echo $?`
if ];then
dt=`date`
touch... (6 Replies)
Discussion started by: whegra
6 Replies
8. Shell Programming and Scripting
I have the following code in bash, however "set red frmt" is not displayed.
echo "iarg_rd = $iarg_rd"
iarg_rd="2"
if ; then
echo "Hello World"
fi
if ; then
frmt="${gap}${!frmt_titl_yl}"
elif ; then
frmt="${gap}${!frmt_titl_bk}"
elif ; then
echo... (2 Replies)
Discussion started by: kristinu
2 Replies
9. Shell Programming and Scripting
Hi All,
I have the requirement that ,i have to write a shell script that job has to wait for a 7 touch files created by another application for 4 hours, if i get all 7 touch files ,i have to send a mail that i jobs are completed, if if it is waiting for more than 4 hours i have to send a mail... (2 Replies)
Discussion started by: Pradeep Shetty
2 Replies
10. Windows & DOS: Issues & Discussions
Hi,
I have run into a problem to which i can't seem to find any solution, posting here is my last resort.
Problem:
I am using plink to access my router and run a few configuration commands. When in enter configurations mode, instead of sending next command plink keeps on waiting for manual... (7 Replies)
Discussion started by: zaainabbas
7 Replies
LEARN ABOUT NETBSD
dh_installdebconf
DH_INSTALLDEBCONF(1) Debhelper DH_INSTALLDEBCONF(1)
NAME
dh_installdebconf - install files used by debconf in package build directories
SYNOPSIS
dh_installdebconf [debhelperoptions] [-n] [--params]
DESCRIPTION
dh_installdebconf is a debhelper program that is responsible for installing files used by debconf into package build directories.
It also automatically generates the postrm commands needed to interface with debconf. The commands are added to the maintainer scripts by
dh_installdeb. See dh_installdeb(1) for an explanation of how that works.
Note that if you use debconf, your package probably needs to depend on it (it will be added to ${misc:Depends} by this program).
Note that for your config script to be called by dpkg, your postinst needs to source debconf's confmodule. dh_installdebconf does not
install this statement into the postinst automatically as it is too hard to do it right.
FILES
debian/package.config
This is the debconf config script, and is installed into the DEBIAN directory in the package build directory.
Inside the script, the token #DEBHELPER# is replaced with shell script snippets generated by other debhelper commands.
debian/package.templates
This is the debconf templates file, and is installed into the DEBIAN directory in the package build directory.
debian/po/
If this directory is present, this program will automatically use po2debconf(1) to generate merged templates files that include the
translations from there.
For this to work, your package should build-depend on po-debconf.
OPTIONS
-n, --no-scripts
Do not modify postrm script.
-- params
Pass the params to po2debconf.
SEE ALSO
debhelper(7)
This program is a part of debhelper.
AUTHOR
Joey Hess <joeyh@debian.org>
11.1.6ubuntu2 2018-05-10 DH_INSTALLDEBCONF(1)