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Shell Programming and Scripting
Relacing the shebang line of a file
Post 302271294 by linuxnewbe on Wednesday 24th of December 2008 06:55:50 PM
12-24-2008
Thank you for your prompt reply 
and it helps me to proceed further. But still I am missing some thing.
Output of the command " sed "s%$(head -1 file1.txt)%#\!$(which ruby)%g" file1.txt " is displaying the modified shebang line along with the contents of the file on the console. But if I pass the o/p using tee operator to the same file the whole contents of the file has been lost.
command:
sed "s%$(head -1 file1.txt)%#\!$(which ruby)%g" file1.txt | tee file1.txt
So I have found a work around to pass the o/p of the command "sed "s%$(head -1 file1.txt)%#\!$(which ruby)%g" file1.txt" to a temparary file and then copying the contents of the temparary file to the original.
command:
sed "s%$(head -1 file1.txt)%#\!$(which ruby)%g" file1.txt | tee file2.txt
cp file2.txt file1.txt
Is there any way I can accomplish the whole task from a single sed command?
and it helps me to proceed further. But still I am missing some thing. Output of the command " sed "s%$(head -1 file1.txt)%#\!$(which ruby)%g" file1.txt " is displaying the modified shebang line along with the contents of the file on the console. But if I pass the o/p using tee operator to the same file the whole contents of the file has been lost.
command:
sed "s%$(head -1 file1.txt)%#\!$(which ruby)%g" file1.txt | tee file1.txt
So I have found a work around to pass the o/p of the command "sed "s%$(head -1 file1.txt)%#\!$(which ruby)%g" file1.txt" to a temparary file and then copying the contents of the temparary file to the original.
command:
sed "s%$(head -1 file1.txt)%#\!$(which ruby)%g" file1.txt | tee file2.txt
cp file2.txt file1.txt
Is there any way I can accomplish the whole task from a single sed command?
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LEARN ABOUT REDHAT
unix2dos
unix2dos(1) General Commands Manual unix2dos(1) NAME
unix2dos - UNIX to DOS text file format converter SYNOPSYS
unix2dos [options] [-c convmode] [-o file ...] [-n infile outfile ...] Options: [-hkqV] [--help] [--keepdate] [--quiet] [--version] DESCRIPTION
This manual page documents unix2dos, the program that converts text files in UNIX format to DOS format. OPTIONS
The following options are available: -h --help Print online help. -k --keepdate Keep the date stamp of output file same as input file. -q --quiet Quiet mode. Suppress all warning and messages. -V --version Prints version information. -c --convmode convmode Sets conversion mode. Simulates unix2dos under SunOS. -o --oldfile file ... Old file mode. Convert the file and write output to it. The program default to run in this mode. Wildcard names may be used. -n --newfile infile outfile ... New file mode. Convert the infile and write output to outfile. File names must be given in pairs and wildcard names should NOT be used or you WILL lost your files. EXAMPLES
Get input from stdin and write output to stdout. unix2dos Convert and replace a.txt. Convert and replace b.txt. unix2dos a.txt b.txt unix2dos -o a.txt b.txt Convert and replace a.txt in ASCII conversion mode. Convert and replace b.txt in ISO conversion mode. unix2dos a.txt -c iso b.txt unix2dos -c ascii a.txt -c iso b.txt Convert and replace a.txt while keeping original date stamp. unix2dos -k a.txt unix2dos -k -o a.txt Convert a.txt and write to e.txt. unix2dos -n a.txt e.txt Convert a.txt and write to e.txt, keep date stamp of e.txt same as a.txt. unix2dos -k -n a.txt e.txt Convert and replace a.txt. Convert b.txt and write to e.txt. unix2dos a.txt -n b.txt e.txt unix2dos -o a.txt -n b.txt e.txt Convert c.txt and write to e.txt. Convert and replace a.txt. Convert and replace b.txt. Convert d.txt and write to f.txt. unix2dos -n c.txt e.txt -o a.txt b.txt -n d.txt f.txt DIAGNOSTICS
BUGS
The program does not work properly under MSDOS in stdio processing mode. If you know why is that so, please tell me. AUTHOR
Benjamin Lin - ( blin@socs.uts.edu.au ) MISCELLANY
Tested environment: Linux 1.2.0 with GNU C 2.5.8 SunOS 4.1.3 with GNU C 2.6.3 MS-DOS 6.20 with Borland C++ 4.02 Suggestions and bug reports are welcome. SEE ALSO
dos2unix(1) 1995.03.31 unix2dos v2.2 unix2dos(1)