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Operating Systems Linux Gentoo cpu%/mem% usage, scripting, dzen2: howto learn bash the hard way Post 302221819 by broli on Tuesday 5th of August 2008 09:18:29 AM
Old 08-05-2008
[QUOTE=era;302221664]Another couple of notes about the use of a temporary file.

First off, if you will never use the first few lines of the temp file, might as well throw them away already at the start.

Code:
top -b -n 1 | tail -n +8 > /tmp/salidatop

[quote]
i will use those lines to have the iddle% and the amount of memory
Quote:
Originally Posted by era
Secondly, when you are done, you should remove your temporary file. Better yet, remove it even if you are interrupted.

Code:
trap 'rm -f /tmp/salidatop; exit $?' 0
trap 'exit 127' 1 2 3 5 15

Put those lines near the beginning of the script.

Properly speaking, you should probably use something like mktemp to generate a unique, unpredictable temporary file name. There are security issues with using predictable names, and having a static file name means you can't run two instances of the script at the same time.
its by design.

about the security risk, i decided that beeing my personal laptop, always in a secure network, and only the contents of top, that is not thread enough to consider some extra precausions
also, my /tmp is wiped out on poweroff and poweron

the script needs X to run, and the script is run by my user config files (fluxbox startup), so there wont be any other instance.
but deniying the posibilitie is a bad idea.
maybe using $$ in some part of the file can do the trick
and adding the trap to make sure i dont left behind tons of temporal files.
 

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script(1)							   User Commands							 script(1)

NAME
script - make record of a terminal session SYNOPSIS
script [-a] [filename] DESCRIPTION
The script utility makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the record is saved in the file typescript. See WARNINGS. The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends when the forked shell exits or when Control-d is typed. OPTIONS
The following option is supported: -a Appends the session record to filename, rather than overwriting it. NOTES
script places everything that appears on the screen in filename, including prompts. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5) WARNINGS
script can pose a security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a privileged user, that is, root. Be sure that typescript is not a link before running script. SunOS 5.10 30 Jan 2004 script(1)
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