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Shell Programming and Scripting
Check file and if it doesnt exist , exit script
Post 302334944 by tententen on Friday 17th of July 2009 12:36:56 AM
07-17-2009
the loop is to check is if the file I want (matches the string) exists, and if it does, keep processing, until the file are no more available
I think my code is wrong logic wise
what is should do is,
1) check if file matching abc.txt.(number) is available or not. eg,
abc.txt.2009070198763
2) if its available, do code
3) if its not available, break loop, exit code.
can anyone come up with a basic code for this please? thank you very much!
check latest file matching string abc.txt.nnnnnnnnnnnn
if exists,
do blablabla
(at final stage I will remove the file processed just now ($lastfile), then,
repeat loop
else (if file not found at the beginning or during next loop)
break loop
exit
I think my code is wrong logic wise
what is should do is,
1) check if file matching abc.txt.(number) is available or not. eg,
abc.txt.2009070198763
2) if its available, do code
3) if its not available, break loop, exit code.
can anyone come up with a basic code for this please? thank you very much!
check latest file matching string abc.txt.nnnnnnnnnnnn
if exists,
do blablabla
(at final stage I will remove the file processed just now ($lastfile), then,
repeat loop
else (if file not found at the beginning or during next loop)
break loop
exit
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LEARN ABOUT X11R4
break
break(1) User Commands break(1) NAME
break, continue - shell built-in functions to escape from or advance within a controlling while, for, foreach, or until loop SYNOPSIS
sh break [n] continue [n] csh break continue ksh *break [n] *continue [n] DESCRIPTION
sh The break utility exits from the enclosing for or while loop, if any. If n is specified, break n levels. The continue utility resumes the next iteration of the enclosing for or while loop. If n is specified, resume at the n-th enclosing loop. csh The break utility resumes execution after the end of the nearest enclosing foreach or while loop. The remaining commands on the current line are executed. This allows multilevel breaks to be written as a list of break commands, all on one line. The continue utility continues execution of the next iteration of the nearest enclosing while or foreach loop. ksh The break utility exits from the enclosed for, while, until, or select loop, if any. If n is specified, then break n levels. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be exited. The continue utility resumes the next iteration of the enclosed for, while, until, or select loop. If n is specified then resume at the n- th enclosed loop. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be used. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words that follow a command preceded by ** that are in the format of a variable assignment are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign, and also that word splitting and file name genera- tion are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), exit(1), ksh(1), sh( 1), attributes(5) SunOS 5.10 17 Jul 2002 break(1)