06-22-2012
My main purpose for the post #1 is to compare two copies (or two versions) of the script, ignoring comments and meaningless white spaces that do not affect execution.
If commands like diff or cmp provide an option to ignore comments and meaningless white spaces, and if two copies (or two versions) of the script can be compared without permanently removing comments and meaningless white spaces, I would be partially satisfied. Does anyone know how to compare two copies (or two versions) of bash script, ignoring comments and meaningless white spaces? I would appreciate it if you show me such a technique.
Even if diff or cmp has an option to ignore comments and meaningless white spaces, the permanent removal of comments and meaningless white spaces would be useful in the following situation. If they are permanently removed, I would be able to take the resultant copies to a GUI OS. I feel more comfortable to perform the comparison on a graphical environment on a GUI OS, after performing the removal on a text-based Unix machine.
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SDIFF(1) GNU Tools SDIFF(1)
NAME
sdiff - find differences between two files and merge interactively
SYNOPSIS
sdiff -o outfile [options] from-file to-file
DESCRIPTION
The sdiff command merges two files and interactively outputs the results to outfile.
If from-file is a directory and to-file is not, sdiff compares the file in from-file whose file name is that of to-file, and vice versa.
from-file and to-file may not both be directories.
sdiff options begin with -, so normally from-file and to-file may not begin with -. However, -- as an argument by itself treats the
remaining arguments as file names even if they begin with -. You may not use - as an input file.
sdiff without -o (or --output) produces a side-by-side difference. This usage is obsolete; use diff --side-by-side instead.
Options
Below is a summary of all of the options that GNU sdiff accepts. Each option has two equivalent names, one of which is a single letter
preceded by -, and the other of which is a long name preceded by --. Multiple single letter options (unless they take an argument) can be
combined into a single command line argument. Long named options can be abbreviated to any unique prefix of their name.
-a Treat all files as text and compare them line-by-line, even if they do not appear to be text.
-b Ignore changes in amount of white space.
-B Ignore changes that just insert or delete blank lines.
-d Change the algorithm to perhaps find a smaller set of changes. This makes sdiff slower (sometimes much slower).
-H Use heuristics to speed handling of large files that have numerous scattered small changes.
--expand-tabs
Expand tabs to spaces in the output, to preserve the alignment of tabs in the input files.
-i Ignore changes in case; consider upper- and lower-case to be the same.
-I regexp
Ignore changes that just insert or delete lines that match regexp.
--ignore-all-space
Ignore white space when comparing lines.
--ignore-blank-lines
Ignore changes that just insert or delete blank lines.
--ignore-case
Ignore changes in case; consider upper- and lower-case to be the same.
--ignore-matching-lines=regexp
Ignore changes that just insert or delete lines that match regexp.
--ignore-space-change
Ignore changes in amount of white space.
-l
--left-column
Print only the left column of two common lines.
--minimal
Change the algorithm to perhaps find a smaller set of changes. This makes sdiff slower (sometimes much slower).
-o file
--output=file
Put merged output into file. This option is required for merging.
-s
--suppress-common-lines
Do not print common lines.
--speed-large-files
Use heuristics to speed handling of large files that have numerous scattered small changes.
-t Expand tabs to spaces in the output, to preserve the alignment of tabs in the input files.
--text Treat all files as text and compare them line-by-line, even if they do not appear to be text.
-v
--version
Output the version number of sdiff.
-w columns
--width=columns
Use an output width of columns. Note that for historical reasons, this option is -W in diff, -w in sdiff.
-W Ignore horizontal white space when comparing lines. Note that for historical reasons, this option is -w in diff, -W in sdiff.
SEE ALSO
cmp(1), comm(1), diff(1), diff3(1).
DIAGNOSTICS
An exit status of 0 means no differences were found, 1 means some differences were found, and 2 means trouble.
GNU Tools 22sep1993 SDIFF(1)