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Top Forums UNIX for Dummies Questions & Answers Search specific string logfile specific date range Post 302936808 by Don Cragun on Saturday 28th of February 2015 01:50:10 AM
Old 02-28-2015
Quote:
Originally Posted by clx
However I checked before responding but its not working for me. Is it version specific?

Code:
$ str="Hello"
$ str+=" "
bash: str+= : command not found
$ str+="World"
bash: str+=World: command not found
$

Yes, it is shell specific and version specific.

You still haven't told us what shell you're using... although it is some version of bash from the diagnostics.

It is in ksh version 93u+ 2012-08-01, but it is not available in any ksh88 and it is not mentioned in the 1995 edition of the book The New Korn shell Command and Programming Language (so it is not available in some earlier versions of ksh93).

I don't know when it was added to bash either.

Note that with any shell based on Bourne shell syntax, you could replace the above with:
Code:
$ str="Hello"
$ str="$str "
$ str="${str}World"
$ echo "$str"
Hello World
$ 


Last edited by Don Cragun; 02-28-2015 at 02:57 AM.. Reason: Note that unknown bash version is used; add portable way to get desired results.
This User Gave Thanks to Don Cragun For This Post:
 

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LOGSAVE(8)						      System Manager's Manual							LOGSAVE(8)

NAME
logsave - save the output of a command in a logfile SYNOPSIS
logsave [ -asv ] logfile cmd_prog [ ... ] DESCRIPTION
The logsave program will execute cmd_prog with the specified argument(s), and save a copy of its output to logfile. If the containing directory for logfile does not exist, logsave will accumulate the output in memory until it can be written out. A copy of the output will also be written to standard output. If cmd_prog is a single hyphen ('-'), then instead of executing a program, logsave will take its input from standard input and save it in logfile logsave is useful for saving the output of initial boot scripts until the /var partition is mounted, so the output can be written to /var/log. OPTIONS
-a This option will cause the output to be appended to logfile, instead of replacing its current contents. -s This option will cause logsave to skip writing to the log file text which is bracketed with a control-A (ASCII 001 or Start of Header) and control-B (ASCII 002 or Start of Text). This allows progress bar information to be visible to the user on the console, while not being written to the log file. -v This option will make logsave to be more verbose in its output to the user. AUTHOR
Theodore Ts'o (tytso@mit.edu) SEE ALSO
fsck(8) E2fsprogs version 1.41.14 December 2010 LOGSAVE(8)
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