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Top Forums Shell Programming and Scripting Reading from a specific line in a loop Post 302217616 by kaushikraman on Wednesday 23rd of July 2008 07:12:28 AM
Old 07-23-2008
Reading from a specific line in a loop

Hello All,

Request you to let me know how to do the below urgently..

Requirement

File A Contains:
for i in file A
DEV1
DEV5
STG1
STG5

File B Contains:
for j in file B
DEV1
DEV5
STG1
STG5


take the first value of i and compare with the other values of j - 4 comparisons

take the second value of i and compare with the other values of j - again 4 comparisons which is not required cos...DEV1 has been already compared with DEV 5 and therefore DEV5 need not be compared with DEV1 again...

Therefore we need to have a logic like...

DEV1 should read lines below it in j
DEV5 should only compare lines below it in j
and so on...

and do i implement this logic....how do i tell the inner loop to do this in UNIX..

Please help...

THank you
 

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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)
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