11-07-2007
Checking the header and trailer for a given string and if not found, exit out of the
hi,
How to check a given file for a string and if it's not found, exit out ofthe script?
e.g. a file Test123 is there whose header begins with #bt and trailer begins with #ed.
I have to check if the header and trailer matches as above and if not, exit out of the script.
How can we do it in Unix and perl.
Thanks in advance.
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UUENCODE(5) File Formats Manual UUENCODE(5)
NAME
uuencode - format of an encoded uuencode file
DESCRIPTION
Files output by uuencode(1C) consist of a header line, followed by a number of body lines, and a trailer line. Uudecode(1C) will ignore
any lines preceding the header or following the trailer. Lines preceding a header must not, of course, look like a header.
The header line is distinguished by having the first 6 characters "begin ". The word begin is followed by a mode (in octal), and a string
which names the remote file. A space separates the three items in the header line.
The body consists of a number of lines, each at most 62 characters long (including the trailing newline). These consist of a character
count, followed by encoded characters, followed by a newline. The character count is a single printing character, and represents an inte-
ger, the number of bytes the rest of the line represents. Such integers are always in the range from 0 to 63 and can be determined by sub-
tracting the character space (octal 40) from the character.
Groups of 3 bytes are stored in 4 characters, 6 bits per character. All are offset by a space to make the characters printing. The last
line may be shorter than the normal 45 bytes. If the size is not a multiple of 3, this fact can be determined by the value of the count on
the last line. Extra garbage will be included to make the character count a multiple of 4. The body is terminated by a line with a count
of zero. This line consists of one ASCII space.
The trailer line consists of "end" on a line by itself.
SEE ALSO
uuencode(1C), uudecode(1C), uusend(1C), uucp(1C), mail(1)
7th Edition May 15, 1985 UUENCODE(5)