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Top Forums Shell Programming and Scripting How to find yesterdays file - shell script Post 302429120 by jim mcnamara on Saturday 12th of June 2010 02:16:30 PM
Old 06-12-2010
Just a note - when you get working respsonses it makes folks here feel like it is homework, when it cannot be used. We have a special forum for homework.

awk, perl, python, grep are all external to shell and require special knowledge of syntax separate from shell. awk is everywhere, perl is close to everywhere; python and ruby are somewhat less ubiquitous.

Straight shell may be possible but for a lot of things; it will require a special tested shell library to run. Generally experienced programmers resort to simpler methods: another environment like awk.

If you have to have shell - get GNU date. That allows date arithmetic operations. Although using date is not straight shell either.

I don't know where folks draw the line between shell and other things, but in reality about 80% of the commonly used "shell" commands are not shell builtins, they are separate code - find, head, tail...etc. try the which command or the type builtin to see what a command really is.

bash will let you create custom builtins, you have to code it in C however.
 

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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 5.11 30 Jan 2004 script(1)
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