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Top Forums Shell Programming and Scripting Remove leading and trailing spaces from a file Post 303000531 by Scrutinizer on Thursday 13th of July 2017 04:56:21 PM
Old 07-13-2017
Hi, you are welcome. It means the following:

  • The awk code use "|" as both input and output field separator (using the FS and OFS awk variables).
  • The for loop iterates over those fields
  • for every field the gsub command replaces leading space (one or more space characters, space or TAB) ^[ \t]+ and trailing space [ \t]+$ by the empty string (contained in uninitialized variable "x").
  • The "1" means "print the record"..
  • This is repeated for every line/record in the file
 

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WRITE(1)						      General Commands Manual							  WRITE(1)

NAME
write - write to another user SYNOPSIS
write user [ ttyname ] DESCRIPTION
Write copies lines from your terminal to that of another user. When first called, it sends the message Message from yourname yourttyname... The recipient of the message should write back at this point. Communication continues until an end of file is read from the terminal or an interrupt is sent. At that point write writes `EOT' on the other terminal and exits. If you want to write to a user who is logged in more than once, the ttyname argument may be used to indicate the appropriate terminal name. Permission to write may be denied or granted by use of the mesg command. At the outset writing is allowed. Certain commands, in particu- lar nroff and pr(1) disallow messages in order to prevent messy output. If the character `!' is found at the beginning of a line, write calls the shell to execute the rest of the line as a command. The following protocol is suggested for using write: when you first write to another user, wait for him to write back before starting to send. Each party should end each message with a distinctive signal--(o) for `over' is conventional--that the other may reply. (oo) for `over and out' is suggested when conversation is about to be terminated. FILES
/etc/utmp to find user /bin/sh to execute `!' SEE ALSO
mesg(1), who(1), mail(1) WRITE(1)
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