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Top Forums Shell Programming and Scripting How to check the user input to be valid using shell script? Post 302774465 by hyeewang on Saturday 2nd of March 2013 12:35:48 AM
Old 03-02-2013
Thank you 2.
I got your idea although I can not run your code due to compile error.
Is there any convenient command to convert or substitute "rwxr-xr-x" to be "111101101"?
That means "change "r","w","x" to be "1", "-" to be "0".
After that, I want to change binary to octal format by "bc"? Is it a good method by "bc"?
I am a beginner. thanks for help.
 

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FLIP(1) 						     Linux Programmer's Manual							   FLIP(1)

NAME
flip, toms, toix - do newline conversions between **IX and MS-DOS SYNOPSIS
flip -h flip [ -umvtsbz] file ... flip [ -umvtsbz] - toix [ -vtsbz] file ... toms [ -vtsbz] file ... DESCRIPTION
flip is a file interchange program that converts text file formats between **ix and MS-DOS. It converts lines ending with carriage-return (CR) and linefeed (LF) to lines ending with just linefeed, or vice versa. If the special argument "-" is given, input is read from stdin and written to stdout. flip has the following features: flip will normally refuse to convert binary files. You can override this. When asked to convert a file to the same format that it already has, flip causes no change to the file. Thus to convert all files to **IX format you can type flip -u * and all files will end up right, regardless of whether they were in MS-DOS or in **IX format to begin with. This also works in the opposite direction. If a file contains isolated CR characters for underlining or overprinting, flip does not change them. flip preserves file timestamps. You can override this. flip preserves file permissions. flip is written in C and will compile and run under MS-DOS/Turbo C, 4.3BSD, and System V. flip accepts wildcards and multiple filenames on the command line. If a user interrupt aborts flip, it does not leave behind any garbage files or cause corruption of the files being converted. When converting from MS-DOS to **IX format, flip removes any trailing control Z (the last character in the file), but leaves embed- ded control Z characters unchanged. This minimizes the possibility of accidentally converting a binary file that contains a control Z near the beginning. You can override this and ask flip to recognize the first control Z found as end-of-file. flip can be asked to strip the high (parity) bit as it converts a file. flip is normally invoked as: flip -umhvtb file ... One of -u, -m, or -h is required. Switches may be given separately or combined together after a dash. For example, the three command lines given below are equivalent: flip -uvt *.c flip -u -v -t *.c flip -u -vt *.c On systems that allow a program to know its own name, flip may be renamed (or linked) to a file called toix for conversion to **IX format, or to a file called toms for conversion to MS-DOS format. When invoked with the name toix or toms, flip will act as if it were invoked with the -u or -m option respectively. OPTIONS
-u Convert to **IX format (CR LF => LF, lone CR or LF unchanged, trailing control Z removed, embedded control Z unchanged). -m Convert to MS-DOS format (lone LF => CR LF, lone CR unchanged). -h Give a help message. -v Be verbose, print filenames as they are processed. -t Touch files (don't preserve timestamps). -s Strip high bit. -b Convert binary files too (else binary files are left unchanged). -z Truncate file at first control Z encountered. AUTHOR
Rahul Dhesi <dhesi@bsu-cs.bsu.edu>. SEE ALSO
unix2dos(1), dos2unix(1). Linux 2.0 July 20, 2002 FLIP(1)
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