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The command substitution and eval and echo are unnecessary.
for (($a_start; $a_expr; $a_eval))
...
a_start='n=north'

Regards,
Alister

To use printf safely, do printf "%s" "mystring"

Since the first string is a format string, % characters in it will be interpreted as formatting specifiers. %s means 'string'. So %s by itself...

The blame for that behavior almost certainly lies with your ls implementation. Which ls are you using?

I can reproduce that behavior with GNU ls. I cannot reproduce it with busybox ls. A closer...

This is definitely a shell-implementation detail that boils down to whether the shell is using the libc functions that fallback to /bin/sh or not.

I installed a few shells on someone's Ubuntu...

You can also grep for characters grep would mistake for parameters by 'disguising' them inside [].

grep "[-][-]" file

You can use the same trick, changing how a regex looks without changing its...

Whether \t is supported or not by sed depends only on the sed implementation itself. The shell is irrelevant. The operating system is irrelevant (except as an indication of which sed implementation...

With this command you will output the names of the files in present dir whose name ends in Kconfig and for each of the found files it will show the entire lines containing both CONFIG_MTD and depend...

I've got error here:

./script.sh
find: paths must precede expression: 2.Kconfig
Usage: find [-H] [-L] [-P] [-Olevel] [-D help|tree|search|stat|rates|opt|exec] [path...] [expression]

[/QUOTE]...

The advantage of the while-read-do-done construct is that you can add to the contents of the loop.
For example:

find ./ -type f -name '*Kconfig' -print | while read filename
do
echo...