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Full Discussion: Incrementing in while loop
Top Forums Shell Programming and Scripting Incrementing in while loop Post 302324394 by cfajohnson on Wednesday 10th of June 2009 03:16:01 PM
Old 06-10-2009
Quote:
Originally Posted by vidyadhar85
you can get rid of few more lines

Who cares? Lines are cheap.

Avoiding redundancy and bloat is one thing; playing golf is best left for amusement.
Quote:
1)if your FIELD2,FIELD 3...FIELD5 are fixed
use the values directly in printf i mean no need to assign them to variable and use it

It is good programming practice to avoid hard-coded values.
Quote:
2)there is no need to assign $start to n

Variables should reflect their purpose. The start doesn't change; only the index changes. What if the start variable is needed later in the program?
Quote:
3)n=$(( $n + 1 )) is <===> n=$((n+1))

The spaces are for legibility.

While POSIX allows the omission of the dollar sign on a variable in arithmetic expansion, the original wording of that part of the spec was not clear, and some major shells (dash and the BSD sh) did not allow it.

Therefore, for portability, it is a good idea to use the dollar sign.
 

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MESSAGES(3)						  libbash messages Library Manual					       MESSAGES(3)

NAME
messages -- libbash library that implements a set of functions to print standard status messages SYNOPSIS
printOK [indent] printFAIL [indent] printNA [indent] printATTN [indent] printWAIT [indent] DESCRIPTION
General messages is a collection of functions to print standard status messages - those [ OK ] and [FAIL] messages you see during Linux boot process. The function list: printOK Prints a standard [ OK ] message (green) printFAIL Prints a standard [FAIL] message (red) printNA Prints a standard [ N/A] message (yellow) printATTN Prints a standard [ATTN] message (yellow) printWAIT Prints a standard [WAIT] message (yellow) Detailed interface description follows. indent Column to move to before printing. Default indent is calculated as TTY_WIDTH-10. If current tty width can not be determined (for example, in case of serial console), it defaults to 80, so default indent is 80-10=10 FUNCTIONS DESCRIPTIONS
printOK [indent] Prints a standard [ OK ] message (green) printFAIL [indent] Prints a standard [FAIL] message (red) printNA [indent] Prints a standard [ N/A] message (yellow) printATTN [indent] Prints a standard [ATTN] message (yellow) printWAIT [indent] Prints a standard [WAIT] message (yellow) EXAMPLES
Run a program named MyProg, and report it's success or failure: echo -n 'Running MyProg...' printWAIT if MyProg ; then printOK else printFAIL fi AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <gil@ran4.net> SEE ALSO
ldbash(1), libbash(1) Linux Epoch Linux
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