Help with Bash Script


 
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Operating Systems Linux Help with Bash Script
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Old 07-12-2006
Help with Bash Script

Hi all,

I'd like to write a bash script to help me manage photo files on our webserver. The website is for a real estate company that gets listing updates daily. New photos are added each day, and updated text files are sent as well with a list of current active records.
I have to find a way to compare all of the photos with all of the active records. If a photo does not have an associated record (because it's been deleted), then delete that photo. I imagine I'll have to run this script once a week so the pictures don't keep piling up, but I can set a cron job to do that.
Each picture is named with a number that corresponds to a field in the record. Oh, and for added fun, there are 6 different tables. I figured I could select all of the property numbers from all of the db tables and append them to a text file. Then I'll have to find some method to compare the photos with the entries in the text file, and whichever photo doesn't have a corresponding entry - just delete it. Does that sound like the easiest way? Any help writing a script to do that would be appreciated.
So far I've been able to write the results of one Select query to a temporary text file that I don't know how to access. I get permission errors when trying to write to a text file in any other directory & I don't know how or where to check the permissions for that. Consider me stuck on this one.

Carrie
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SCRIPT(1)							   User Commands							 SCRIPT(1)

NAME
script - make typescript of terminal session SYNOPSIS
script [options] [file] DESCRIPTION
script makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file type- script. OPTIONS
-a, --append Append the output to file or typescript, retaining the prior contents. -c, --command command Run the command rather than an interactive shell. This makes it easy for a script to capture the output of a program that behaves differently when its stdout is not a tty. -e, --return Return the exit code of the child process. Uses the same format as bash termination on signal termination exit code is 128+n. -f, --flush Flush output after each write. This is nice for telecooperation: one person does `mkfifo foo; script -f foo', and another can supervise real-time what is being done using `cat foo'. --force Allow the default output destination, i.e. the typescript file, to be a hard or symbolic link. The command will follow a symbolic link. -q, --quiet Be quiet. -t, --timing[=file] Output timing data to standard error, or to file when given. This data contains two fields, separated by a space. The first field indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used to replay typescripts with realistic typing and output delays. -V, --version Output version information and exit. -h, --help Output help and exit. NOTES
The script ends when the forked shell exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. Script works best with commands that do not manipulate the screen, the results are meant to emulate a hardcopy terminal. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism), scriptreplay(1). HISTORY
The script command appeared in 3.0BSD. BUGS
Script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. AVAILABILITY
The script command is part of the util-linux package and is available from Linux Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils/util- linux/>. util-linux September 2011 SCRIPT(1)