I am working on a bigger awk script in which one part is comparing the size of two files.
I want to evaluate which file is bigger and then just save the bigger one.
I got it all working except for the part where I want to figure out which file is bigger; the one awk is currently reading (->FILENAME) or the one that already lies there.
So how do you get the output of
into awk while supplying it with FILENAME?
But that ends up in <Permission Denied> (Don't ask me why, I am the owner of the script as well as the files to be read)
Another approach was system():
But fsize ends up being 0, since its just the status of the cmd, or something like that.
Next approach I found online involved something like this:
But that obviously can't work because FILENAME is an awk variable. And I don't see a way of putting FILENAME in that command.
It would be really great if someone has some idea on how to solve the problem. I have been sitting on this problem for a couple of hours now and I am starting to go nuts...
The system command will not work for you because all that awk makes available is the return code which will be 0 for success or !0 for failure. You could use system and have the command output redirected to a file, then read the file, but that's a lot of unnecessary work.
Your attempt at getline seems flawed only in that you've escaped the newline without terminating the statement with a semicolon. The following works for me with GNU Awk 3.1.6.
You also need to remember to close the "command" after you are done. The close must be passed the exact command string that you started the pipe with which is why I usually put it into a variable, or write a standalone function (example below) to deal with external commands.
Hi,
I was searching for a way to grep 2 lines before and after a certain keyword, and I came across the following code..
awk "\$0 ~ /ORA-/ {
cmd=\"awk 'NR>=\" NR-2 \" && NR<=\" NR+2 \"' init.ora\"
system(cmd)
}" input_file
I could not understand how this works. What is system() ? what... (2 Replies)
I am having exactly the same problem with https://www.unix.com/programming/129264-application-cleanup-during-linux-shutdown.html but the thread is old and closed. The only difference is that I use sigaction() instead of signal(), which is recommended, as far as I know.
This is my code:
... (9 Replies)
Hi Experts,
I am trying to get system output to capture inside awk , but not working:
Please advise if this is possible :
I am trying something like this but not working, the output is coming wrong:
echo "" | awk '{d=system ("date") ; print "Current date is:" , d }'
Thanks, (5 Replies)
Hello All,
I'm writing a Bash Script and in it I execute a piped command within a Function I wrote and I can't seem to redirect the
stderr from the 1st pipe to stdout..?
I'm setting the output to an Array "COMMAND_OUTPUT" and splitting on newlines using this --> "( $(...) )". By putting... (6 Replies)
hello,
I want to print my output into a file inside of awk, but I don't know it could wokr with using system (piping the $1-4 to another shellskript):
cat file.txt |awk '{ if ($5==2) {dataname=$1 "_" $2 "_" $3 "_" $4 "_typing.rad"
befehl=".gen_test " $7 " " $8 " " $8
system(befehl) >... (5 Replies)
Hello,
We have an oracle database running on a Linux host (RHEL5)...I'm trying to run Oracle dbv (database verify utility) and capture its output to a file using the following syntax but the standart output does NOT get redirected to the file...
dbv blocksize=32768 ... (2 Replies)
Hi all, I'd like to capture the output from the 'top' command to monitor my CPU and Mem utilisation.Currently my command isecho date
`top -b -n1 | grep -e Cpu -e Mem` I get the output in 3 separate lines.Tue Feb 24 15:00:03
Cpu(s): 3.4% us, 8.5% sy .. ..
Mem: 1011480k total, 226928k used, ....... (4 Replies)
I was wondering if it was possible to tell awk to print the output of a command in the print.
.... | awk '{print $0}'
I would like it to print the date right before $0, so something like (this doesn't work though)
.... | awk '{print date $0}' (4 Replies)
In 'C' I am trying to use the sendmail to send a message that program completed successful or failed.
The syntax is:
sprintf(cmd,"/usr/sbin/sendmail roncayenne@ssss.org to: roncayenne@ssss.org from:root subject: PROGRAM SUCCESSFUL .");
system(cmd);
But this is not working. Seems it does not... (3 Replies)
I have the following line in my script:
$sftpcmd $rmthost <<COMMANDS>> $sftplog 2>&1
For some reason this is not capturing the errors from sftp, they go to the file attached to the cron entry
ie
mm hh dd MM * /myscript > cron.out
any idea why?
digital unix 4.0d (6 Replies)