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Top Forums Shell Programming and Scripting Delete all log files older than 10 day and whose first string of the first line is "MSH" or "<?xml" Post 302991886 by RudiC on Friday 17th of February 2017 12:44:27 PM
Old 02-17-2017
Just guessing that you are not running a (recent) bash for your "substring expansion" ${firstLine:0:3} as it is the usual syntax and should work. ${cut -c1-8} should be a "command substitution" in the syntax $(cut -c1-8) but needs an input file to work upon.
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strclean(1M)															      strclean(1M)

NAME
strclean - remove outdated STREAMS error log files SYNOPSIS
logdir] age] DESCRIPTION
cleans the STREAMS error logger directory of log files mm-dd) that contain error messages sent by the STREAMS log driver, strlog(7). If the option is not used to specify another directory, removes error log files in the directory. If the option is not used to specify another age, removes error log files that have not been modified in three days. Options recognizes the following options and command-line arguments: Specifies a directory for the location of the STREAMS error log files to be removed if this is not the default directory Specifies a maximum age in days for the STREAMS error log files if this not the default age of 3. The value of age must be an integer greater than or less than 3. EXAMPLES
Remove day-old error log files from a directory called FILES
One or more error log file or files on which operates. The mm-dd in the filename indicates the month and day of the messages con- tained in the file. NLS catalog for SEE ALSO
strerr(1M), strlog(7). strclean(1M)
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