Here is an example code that shows the issue I have:
If I understand it correctly, "head" finishes on the first match (as expected), but "grep" is not aware of it until it tries to write the next line (the second match). When it does, it finds out the pipe is closed so it also finishes.
That's normally not a problem, but if you have an infinite input stream containing only one match, it won't never stop. Any solution?
Hi Everyone
I am building some A Class HP boxes as web proxy servers, have just installed HP-UX 11.00 and am starting to configure one according to our standard build policy.
However on the A Class I just happened to place the software depot this error message keeps popping up every 2 mins:
... (1 Reply)
I have written the following program. The function of this prog is to read data from a file(source.c) and write into another file(dest.c) using pipes. I have just written a line in the source file.Im able to compile and run the program without errors. But the data is not written onto the other... (2 Replies)
hi all,
this is how my scrip looks like
#!/bin/sh
bindir='/opt/apps/script/bin'
datadir='/opt/apps/script/data'
dir='/opt/apps/script'
while : ; do
ls -1rt /opt/apps/script/data/check.txt*|tail -1 > /dev/null 2>&1
if ;then
chmod +rwx $bindir/dummy2.sh
... (8 Replies)
Hi all,
I tried the following command
$ find / -name xyx | ls -l
so logically it should show the listing of directory xyz , assuming there's only one instance of xyz . But the above command shows the listing of current directory instead.
I got the desired result using it in the... (4 Replies)
Hello Everybody,
thanks in advance for spending some time in my problem.
My problem is this:
I want to call a java-Programm out of my shell skript, check if die return code is right, and split the output to the normal output and into a file.
The following code doesn't work right, because in... (2 Replies)
I want to have a message send & receive through 2 half-duplex pipes
Flow of data
top half pipe
stdin--->parent(client) fd1--->pipe1-->child(server) fd1
bottom half pipe
child(server) fd2---->pipe2--->parent(client) fd2--->stdout
I need to have boundary structed message... (1 Reply)
Hi!
I'm having problems with pipes... I need comunnications with childs processes and parents, but only one child can comunnicate with parent (first child), others childs can't.
A brief of code:
if(pipe(client1r)<0){
perror("pipe");
}
... (1 Reply)
1. The problem statement, all variables and given/known data:
My problem is an infinite loop when i press any other key other then Y or y in the while loop. what i want it to do is return to the normal script outside of it if pressing N or n or keep asking the same question if its any other... (4 Replies)
Discussion started by: Ren_kun
4 Replies
LEARN ABOUT CENTOS
grub2-fstest
GRUB-FSTEST(3) Library Functions Manual GRUB-FSTEST(3)NAME
grub-fstest -- Debug tool for GRUB's filesystem driver.
SYNOPSIS
grub-fstest [-c | --diskcount=NUM] [-C | --crypto]
[-d | --debug=STRING] [-K | --zfs-key=FILE|prompt]
[-n | --length=NUM] [-r | --root=DEVICE_NAME]
[-s | --skip=NUM] [-u | --uncompress] [-v | --verbose]
IMAGE_PATH <blocklist FILE | cat FILE |
cmp FILE LOCAL | cp FILE LOCAL | crc FILE |
hex FILE | ls PATH | xnu_uuid DEVICE>
DESCRIPTION
grub-fstest is a tool for testing GRUB's filesystem drivers. You should not normally need to run this program.
OPTIONS --diskcount=NUM
Specify the number of input files.
--crypto
Mount cryptographic devices.
--debug=STRING
Set debug environment variable.
--zfs-key=FILE|prompt
Load ZFS cryptographic key.
--length=NUM
Handle NUM bytes in output file.
--root=DEVICE_NAME
Set root device.
--skip=NUM
Skip NUM bytes from output file.
--uncompress
Uncompress data.
--verbose
Print verbose messages.
COMMANDS
blocklist FILE
Display block list of FILE.
cat FILE
Display FILE on standard output.
cmp FILE LOCAL
Compare FILE with local file LOCAL.
cp FILE LOCAL
Copy FILE to local file LOCAL.
crc FILE
Display the CRC-32 checksum of FILE.
hex FILE
Display contents of FILE in hexidecimal.
ls PATH
List files at PATH.
xnu_uuid DEVICE
Display the XNU UUID of DEVICE.
SEE ALSO
info grub
Wed Feb 26 2014 GRUB-FSTEST(3)