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Full Discussion: add up time with xx:yy format in bash how?
Top Forums Shell Programming and Scripting add up time with xx:yy format in bash how? Post 302599997 by agama on Sunday 19th of February 2012 09:40:54 PM
Old 02-19-2012
Don't confuse the shell variable expansion substitution syntax with regular expressions because they are (just as confusing at first) and quite different.

For the full list of possibilities have a look at one of the shell man pages, for example the kshell page:
man/man1/ksh.html man page

The parameter expansion is about 25% down in the page (search for %% and you'll find it).

Specifically. ${name%%:*} expands the value in the variable 'name' and matches the longest pattern ":*" that is at the end of the string. The part of the expansion that is matched is truncated. So, if name contains ab:cd:ef, the expression above would match ":cd:ef" and delete that leaving just "ab".

The ${name:##*:} does the same kind of truncation, but starting from the beginning of the string. Again, if name contains "ab:cd:ef" then only "ef" would be left as the longest pattern from the beginning to ':' is "ab:cd:".

As for your error, it's treating the leading 0 as an indicator that the value should be an octal number. I don't usually work in bash -- Kshell's evaluation supports floating point calculations and doesn't make this assumption, so I wasn't aware that this would be an issue. You can compensate for this behaivour with this:

Code:
   h=$(( ${h#0} + ${x%%:*} ))  
   m=$(( ${m#0} + ${x##*:} ))

This is similar to the examples I gave above, but it matches the shortest pattern starting at the beginning of the line. So if h == "04" the expansion will just be 4, and bash won't complain. If h == "00" the expansion will be 0 which again will be fine. Finally, if h == "12" there isn't a match so there isn't a truncation.

Good luck!

---------- Post updated at 21:40 ---------- Previous update was at 21:39 ----------

Quote:
Originally Posted by bashily
I fixed it. it is base 8 and I need to force bash to recognize these number as decimal by using 10# in front of the number!
Nice job!!

That happens to be a trick that I didn't know -- I approached it a bit differently, so as usual, I learned something too.
This User Gave Thanks to agama For This Post:
Brusimm
 

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LEARN ABOUT OPENSOLARIS

acctcms

acctcms(1M)						  System Administration Commands					       acctcms(1M)

NAME

       acctcms - command summary from process accounting records

SYNOPSIS

       /usr/lib/acct/acctcms [-a [-o] [-p]] [-c] [-j] [-n] [-s]
	    [-t] filename...

DESCRIPTION

       acctcms reads one or more filenames, normally in the form described in acct.h(3HEAD). It adds all records for processes that executed iden-
       tically named commands, sorts them, and writes them to the standard output, normally using an internal summary format.

OPTIONS

       -a    Print output in ASCII rather than in the internal summary format. The output includes command name, number of times  executed,  total
	     kcore-minutes,  total  CPU  minutes,  total real minutes, mean size (in K), mean CPU minutes per invocation, "hog factor," characters
	     transferred, and blocks read and written, as in acctcom(1). Output is normally sorted by total kcore-minutes.

	     Use the following options only with the -a option:

	     -o    Output a (non-prime) offshift-time-only command summary.

	     -p    Output a prime-time-only command summary.

	     When -o and -p are used together, a combination prime-time and non-prime-time report is produced.	All the output summaries are total
	     usage except number of times executed, CPU minutes, and real minutes, which are split into prime and non-prime.

       -c    Sort by total CPU time, rather than total kcore-minutes.

       -j    Combine all commands invoked only once under "***other".

       -n    Sort by number of command invocations.

       -s    Any file names encountered hereafter are already in internal summary format.

       -t    Process  all records as total accounting records. The default internal summary format splits each field into prime and non-prime-time
	     parts. This option combines the prime and non-prime time parts into a single field that is the total of  both,  and  provides  upward
	     compatibility with old style acctcms internal summary format records.

EXAMPLES

       Example 1 Using the acctcms command.

       A typical sequence for performing daily command accounting and for maintaining a running total is:

	 example% acctcms filename ... > today
	 example% cp total previoustotal
	 example% acctcms -s today previoustotal > total
	 example% acctcms -a -s today

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWaccu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       acctcom(1),  acct(1M),  acctcon(1M),  acctmerg(1M),  acctprc(1M),  acctsh(1M),  fwtmp(1M),  runacct(1M),  acct(2), acct.h(3HEAD), utmpx(4),
       attributes(5)

NOTES

       Unpredictable output results if -t is used on new style internal summary format files, or if it is not used with old style internal summary
       format files.

SunOS 5.11							    22 Feb 1999 						       acctcms(1M)
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