Hi,
I want to do the foll steps:
1. Check if someone has a lock on my file1.
2. if file1 is locked by any other user
wait in a loop till another user releases lock
3. when lock released, lock file1.
4. do procesing (write) on file1.
5. processing complete. release lock on file1.
... (2 Replies)
Hi,
I want to know my file is 1 hr 30 min old or not,
If 1 hr 30 min old I will do some tasks in that file.. other wise I will wait to 1 hr 30 min and then do the tasks.. how to do it in Unix script? any idea? (3 Replies)
:cool:
I need to execute a shell script to do the following:
cat a file
run two back ground processes using the first two values from the file
wait till those background processes finish
run two more background processes using the next two values from the file
wait till those background... (1 Reply)
Did not use 'wait' yet.
How I understand by now the wait works only for child processes, started background.
Is there any other way to watch completion of any, not related process (at least, a process, owned by the same user?)
I need to start a background process, witch will be waiting... (2 Replies)
I have to schedule a script in cron that watch for a trigger file named as xyz_extract_file_20081201.null (the YYYYMMDD portion would change every day). The wait/wakeup time would be 1 min and the date portion will always be current date (Eg., the trigger file named as... (2 Replies)
i want to do 2 things
1) i should wait for a file called A.txt to fall on a specific path on the server
2) once the file arrives immediately another script called B.sh should be executed.
Could you please throw somelight on this.
Any code if already present that would be helpful.
... (13 Replies)
I'm a novice at unix and need it more and more to do my work.
I seem running into problems getting this script "attempt" to work:
I need to copy all files in a directory, which is containing 22000 files, into a directory one level up. There a tool monitors the content of the dir and processes... (2 Replies)
Hello,
I need to evaluate (under BASH) if the certain file has been updated or not. If the file still wasn't updated, script should wait. The script picks up the time stamp of the file using command OldTimestamp=$(date -r $MyDir/$MyFile), but I don't know how to code a waiting loop with new and... (6 Replies)
Hi,
I am facing a strange issue,
when i call a script from my while loop in background it doesnt go in background, despite the wait i put below the whil loop it goes forward even before the process put in background is completed.
cat abc.txt | while read -u4 line
do
#if line contains #... (2 Replies)
Hi,
I have a requirement to create below script:
Script must run infinitely in background.
It will check a particular type of file to be copied in specific folder of server
Script must wait till any file gets fully copied ..(important) and then
It will read that file
Experts please... (4 Replies)
Discussion started by: Vikash163
4 Replies
LEARN ABOUT V7
ppmtosixel
ppmtosixel(1) General Commands Manual ppmtosixel(1)NAME
ppmtosixel - convert a portable pixmap into DEC sixel format
SYNOPSIS
ppmtosixel [-raw] [-margin] [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Produces sixel commands (SIX) as output. The output is formatted for color printing, e.g. for a DEC
LJ250 color inkjet printer.
If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled. A printer control header and a color assignment table
begin the SIX file. Image data is written in a compressed format by default. A printer control footer ends the image file.
OPTIONS -raw If specified, each pixel will be explicitly described in the image file. If -raw is not specified, output will default to com-
pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands. A raw file is often an order of magni-
tude larger than a compressed file and prints much slower.
-margin
If -margin is not specified, the image will be start at the left margin (of the window, paper, or whatever). If -margin is speci-
fied, a 1.5 inch left margin will offset the image.
PRINTING
Generally, sixel files must reach the printer unfiltered. Use the lpr -x option or cat filename > /dev/tty0?.
BUGS
Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion. If the original PPM maxval was
greater than 100, rescaling also reduces the image depth. While the actual RGB values from the ppm file are more or less retained, the
color palette of the LJ250 may not match the colors on your screen. This seems to be a printer limitation.
SEE ALSO ppm(5)AUTHOR
Copyright (C) 1991 by Rick Vinci.
26 April 1991 ppmtosixel(1)