I’m studying Unix, and i need help writing a script. The script requires that it outputs the number of months and years from January 2007 to December 2017 inclusive that have a Friday the thirteenth.
In your book Wicked Cool Shell Scripts, on p. 115, Script #40 Reporting Disk Hogs, on the 8th line the second part of the line reads:
awk -F: ‘$2 > 99 {print $1} ‘)
I am very new to shell scripting, so I am probably just not understanding how this line should be interpreted. In my Linux class, I have been learning that in the /etc/passwed file the 1st field is username, the 2nd field is password (x), and the third field is the UID, so wouldn’t the $2 above really be $3 so that the script would be checking to see if the UID field, which is field 3 is greater that 99, not the password field,which is field 2? Please let me know, since this is confusing to me. Thanks for your help.
I’ve been experimenting with mencoder to convert my AVI movies into a format that I can download onto my cellphone and finally found a site where they explain the various parameters needed for the mencoder program to get it to work. Problem is, they’re a pain to type in each time. How do I turn an ugly command line invocation into a nice shell script?
Hi i am trying to comapre numbers for the biggest among double type of numbers. For example: 0.254, 0.255, 0.564, 0.984, 0.556, 0.6566, and 0.5666.
I’m using the following script code:
if [ $max -lt $i ]
if [ “$max -lt “$i” ]
But they all give the error message “integer expression expected”. Help!
I have a script that does an ftp from a SCO UNIX server to windows server to get files from the windows server. The script is set in the cron to run every xx minutes. Sometimes the script will hang and leave a process running. This can bog down the UNIX server. I want to be able to do two things. 1. I want to make sure that the script doesn’t hang – so it should terminate after xx minutes (the files are very small that it is getting). And 2. I want the script to test to make sure that it is not already running, before starting again. THANKS
I’ve been looking at your script to count executable binaries in the book Wicked Cool Shell Scripts and I think that there’s a problem in the script. Specifically, what happens if I have a directory in my PATH more than once?
I run a fairly busy Web site with a variety of different image directories. The problem is, Apache shows directories in a fairly rudimentary way which makes it quite difficult to find a specific image if I don’t remember its name. Is there a better way with some sort of shell scripting?
Just picked up your book Wicked Cool Shell Scripts and already have one quick question: While working on the startup scripts, I would like to place log timers at certain portions of scripts. Is it possible to log point A at he beginning of a section, do the processing, log point B at the end of the section and then log B minus A so I know exactly how long a section took to process?
