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Top Forums UNIX for Advanced & Expert Users Need help to delete special characters exists only at the end of the each record in UNIX file? Post 303030210 by Don Cragun on Thursday 7th of February 2019 05:49:53 AM
Old 02-07-2019
Hi Rakesh,
You say that the letter M at the end of each input line is special and has to be removed. The letter M can't be removed if you say it is not special. We can't possibly meet your requirements if your requirements are inconsistent.

If you want to change your requirements to only remove sequences of characters that are not a space character and that are not alphanumeric characters from the end of each input line, the output produced from your sample input will be identical to the input because the last character is an alphanumeric character!

You had several suggestions earlier that, among many other things, removed all non-alphanumeric characters from the end of field 15 or from the end of the input record and you rejected all of them because they didn't get rid of trailing M.

I give up!
 

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read(n) 						       Tcl Built-In Commands							   read(n)

__________________________________________________________________________________________________________________________________________________

NAME
read - Read from a channel SYNOPSIS
read ?-nonewline? channelId read channelId numChars _________________________________________________________________ DESCRIPTION
In the first form, the read command reads all of the data from channelId up to the end of the file. If the -nonewline switch is specified then the last character of the file is discarded if it is a newline. In the second form, the extra argument specifies how many characters | to read. Exactly that many characters will be read and returned, unless there are fewer than numChars left in the file; in this case all | the remaining characters are returned. If the channel is configured to use a multi-byte encoding, then the number of characters read may | not be the same as the number of bytes read. | If channelId is in nonblocking mode, the command may not read as many characters as requested: once all available input has been read, the | command will return the data that is available rather than blocking for more input. If the channel is configured to use a multi-byte | encoding, then there may actually be some bytes remaining in the internal buffers that do not form a complete character. These bytes will | not be returned until a complete character is available or end-of-file is reached. The -nonewline switch is ignored if the command returns before reaching the end of the file. Read translates end-of-line sequences in the input into newline characters according to the -translation option for the channel. See the fconfigure manual entry for a discussion on ways in which fconfigure will alter input. SEE ALSO
file(n), eof(n), fblocked(n), fconfigure(n) KEYWORDS
blocking, channel, end of line, end of file, nonblocking, read, translation, encoding Tcl 8.1 read(n)
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