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Top Forums Shell Programming and Scripting Bash - proper way to append variable to stderr Post 303003601 by MadeInGermany on Sunday 17th of September 2017 02:34:07 AM
Old 09-17-2017
If you have single lines in a loop you do not need another loop within
Code:
for i in {1..8} ; do ls -al file$i 2> >( read line; echo "$(date): ${line}" >> error.log ) ; done

It is more efficient to have two loops indeed, but one after the other
Code:
for i in {1..8} ; do ls -al file$i; done 2> >( while read line; do echo "$(date): ${line}"; done >> error.log )

where error.log is written in one stream, so you have the option > error.log
And in the case of date, if its output does not change much, one can store it in a variable first, and several time refer to the variable.
Code:
date=$(date); for i in {1..8} ; do ls -al file$i; done 2> >( while read line; do echo "${date}: ${line}"; done >> error.log )

Code:
for i in {1..8} ; do ls -al file$i; done 2> >( date=$(date); while read line; do echo "${date}: ${line}"; done >> error.log )


Last edited by MadeInGermany; 09-17-2017 at 03:54 AM..
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DATETIME.SETISODATE(3)							 1						    DATETIME.SETISODATE(3)

DateTime::setISODate - Sets the ISO date

       Object oriented style

SYNOPSIS
public DateTime DateTime::setISODate (int $year, int $week, [int $day = 1]) DESCRIPTION
Procedural style DateTime date_isodate_set (DateTime $object, int $year, int $week, [int $day = 1]) Set a date according to the ISO 8601 standard - using weeks and day offsets rather than specific dates. PARAMETERS
o $object -Procedural style only: A DateTime object returned by date_create(3). The function modifies this object. o $year - Year of the date. o $week - Week of the date. o $day - Offset from the first day of the week. RETURN VALUES
Returns the DateTime object for method chaining or FALSE on failure. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.3.0 | | | | | | | Changed the return value on success from NULL to | | | DateTime. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 DateTime.setISODate(3) example Object oriented style <?php $date = new DateTime(); $date->setISODate(2008, 2); echo $date->format('Y-m-d') . " "; $date->setISODate(2008, 2, 7); echo $date->format('Y-m-d') . " "; ?> Procedural style <?php $date = date_create(); date_isodate_set($date, 2008, 2); echo date_format($date, 'Y-m-d') . " "; date_isodate_set($date, 2008, 2, 7); echo date_format($date, 'Y-m-d') . " "; ?> The above examples will output: 2008-01-07 2008-01-13 Example #2 Values exceeding ranges are added to their parent values <?php $date = new DateTime(); $date->setISODate(2008, 2, 7); echo $date->format('Y-m-d') . " "; $date->setISODate(2008, 2, 8); echo $date->format('Y-m-d') . " "; $date->setISODate(2008, 53, 7); echo $date->format('Y-m-d') . " "; ?> The above example will output: 2008-01-13 2008-01-14 2009-01-04 Example #3 Finding the month a week is in <?php $date = new DateTime(); $date->setISODate(2008, 14); echo $date->format('n'); ?> The above examples will output: 3 SEE ALSO
DateTime.setDate(3), DateTime.setTime(3). PHP Documentation Group DATETIME.SETISODATE(3)
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