Hi ,
I am having one situation in which I need to run some simple unix commands after doing "chroot" command in a shell script. Which in turn creates a new shell.
So scenario is that
- I need to have one shell script which is ran as a part of crontab
- in this shell script I need to do a... (2 Replies)
I have written a code to extract comma seperated values from a file and assign them to a variable inside awk code.i want to use one of these variable to be used in wget function i.e to pass the siteurl.How i can implement the shell command wget inside the awk for loop.code snippet is shown below. ... (8 Replies)
Hi friends this is first post i am very new to shell scripting so i require your expertise to do the following thank u
I need to write a shell script which will run the following commands
pg_dump bank > backup(Enter)
Wait for bash prompt to appear coz it indicates that the command is... (23 Replies)
Can anyone help me out in visualizing on what is the logic behind simple unix commands. For Eg: ls command lists files and directories, how it displays I need to know the source code for commands like this. (1 Reply)
Hi
Can I thank the advice I've received on here previously, working examples are helping me teach myself BASH fairly quickly and I've written some pretty complex scripts now (even if I do say so myself).
Anyhooo.....
I'm writing a script that handles lots of text files and does various... (3 Replies)
Hello;
When I try:
awk '/$(date "+%y\/%m\/%d")/,0'
It errors with:
awk: There is a regular expression error.
Invalid pattern.
Is there anyway to make this work ??
Thank you (2 Replies)
Hello everyone,
I am trying to embed some tcl code inside a ksh93 script but I am not having any success.
I even tried the simplest of code, something like this:
.
.
jk=$(echo $(tcl << |
write_file junkme "test"'
|
))
just to see if a file gets written. When I run there are no errors, but ... (3 Replies)
Hi I would like to embed a sql query in my shell script.
Also, before any the sql query is executed, i would like to validate username and password. (1 Reply)
hi,
trying to embed an image to the html file to send out as an email.
img src="data:image/jpeg;base64,$(base64 /home/test/abc.jpg
but getting error as file not found after it aplies base64 on the file. (8 Replies)
Hi Folks -
Is there a way to add two execs to one script? For instance, I need to redirect the stdout and stderr to two separate directories. I want to do this:
#::-- Direct STDOUT and STDERROR to repositories --::#
exec 2>"${_ERRORFILE}" > "${_LOGFILE}"
exec 2>"/new/path/file.err" >... (7 Replies)
Discussion started by: SIMMS7400
7 Replies
LEARN ABOUT FREEBSD
sleep
SLEEP(1) BSD General Commands Manual SLEEP(1)NAME
sleep -- suspend execution for an interval of time
SYNOPSIS
sleep seconds
DESCRIPTION
The sleep command suspends execution for a minimum of seconds.
If the sleep command receives a signal, it takes the standard action. When the SIGINFO signal is received, the estimate of the amount of
seconds left to sleep is printed on the standard output.
IMPLEMENTATION NOTES
The SIGALRM signal is not handled specially by this implementation.
The sleep command allows and honors a non-integer number of seconds to sleep in any form acceptable by strtod(3). This is a non-portable
extension, and its use will nearly guarantee that a shell script will not execute properly on another system.
EXIT STATUS
The sleep utility exits 0 on success, and >0 if an error occurs.
EXAMPLES
To schedule the execution of a command for x number seconds later (with csh(1)):
(sleep 1800; sh command_file >& errors)&
This incantation would wait a half hour before running the script command_file. (See the at(1) utility.)
To reiteratively run a command (with the csh(1)):
while (1)
if (! -r zzz.rawdata) then
sleep 300
else
foreach i (`ls *.rawdata`)
sleep 70
awk -f collapse_data $i >> results
end
break
endif
end
The scenario for a script such as this might be: a program currently running is taking longer than expected to process a series of files, and
it would be nice to have another program start processing the files created by the first program as soon as it is finished (when zzz.rawdata
is created). The script checks every five minutes for the file zzz.rawdata, when the file is found, then another portion processing is done
courteously by sleeping for 70 seconds in between each awk job.
SEE ALSO nanosleep(2), sleep(3)STANDARDS
The sleep command is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.
HISTORY
A sleep command appeared in Version 4 AT&T UNIX.
BSD April 18, 1994 BSD