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Full Discussion: Redirecting STDERR to file and screen, STDOUT only to file
Top Forums Shell Programming and Scripting Redirecting STDERR to file and screen, STDOUT only to file Post 302697741 by bakunin on Friday 7th of September 2012 09:46:34 AM
Old 09-07-2012
Quote:
Originally Posted by alister
The y-shaped hose and bucket analogy paints a memorable image. Nicely done.
Thank you for this, as well as the additional info. I was not aware that <stderr> is unbuffered while <stdout> is not, so i have learned more here than i have explained. Nice gain. ;-))


It is probably a good idea to do like i have always done (out of luck - you have given me a reason after all) in my scripts: prepend standard and error output with respective prefixes:

Code:
#! /bin/ksh
...
print -u1 "MSG: $(timestamp) , starting the action"
action
if [ $? -gt 0 ] ; then
     print -u2 "ERR: $(timestamp) , action did not work"
else
     print -u1 "MSG: $(timestamp) , action worked out well"
fi
...

bakunin
 

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LEARN ABOUT DEBIAN

sconsign

SCONSIGN(1)						      General Commands Manual						       SCONSIGN(1)

NAME

       sconsign - print SCons .sconsign file information

SYNOPSIS

       sconsign [ options...  ] file [ ... ]

DESCRIPTION

       The sconsign command displays the contents of one or more .sconsign files specified by the user.

       By default, sconsign dumps the entire contents of the specified file(s).  Each entry is printed in the following format:

	   file: signature timestamp length
		   implicit_dependency_1: signature timestamp length
		   implicit_dependency_2: signature timestamp length
		   action_signature [action string]

       None  is  printed  in  place  of any missing timestamp, bsig, or csig values for any entry or any of its dependencies.  If the entry has no
       implicit dependencies, or no build action, the lines are simply omitted.

       By default, sconsign assumes that any file arguments that end with a .dbm suffix contains signature entries for	more  than  one  directory
       (that  is,  was	specified  by  the  SConsignFile () function).	Any file argument that does not end in .dbm is assumed to be a traditional
       .sconsign file containing the signature entries for a single directory.	An explicit format may	be  specified  using  the  -f  or  --file=
       options.

OPTIONS

       Various options control what information is printed and the format:

       -a, --act, --action
	      Prints the build action information for all entries or the specified entries.

       -c, --csig
	      Prints the content signature (csig) information for all entries or the specified entries.

       -d DIRECTORY, --dir=DIRECTORY
	      When  the  signatures are being read from a .dbm file, or the -f dbm or --format=dbm options are used, prints information about only
	      the signatures for entries in the specified DIRECTORY.

       -e ENTRY, --entry=ENTRY
	      Prints information about only the specified ENTRY.  Multiple -e options may be used, in which case information about each  ENTRY	is
	      printed in the order in which the options are specified on the command line.

       -f FORMAT, --format=FORMAT
	      The  file(s)  to be printed are in the specified FORMAT.	Legal values are dbm (the DBM format used when the SConsignFile() function
	      is used) or sconsign (the default format used for an individual .sconsign file in each directory).

       -h, --help
	      Prints a help message and exits.

       -i, --implicit
	      Prints the list of cached implicit dependencies for all entries or the the specified entries.

       --raw  Prints a pretty-printed representation of the raw Python dictionary that holds build information about individual  entry	(both  the
	      entry itself or its implicit dependencies).  An entry's build action is still printed in its usual format.

       -r, --readable
	      Prints timestamps in a human-readable string, enclosed in single quotes.

       -t, --timestamp
	      Prints the timestamp information for all entries or the specified entries.

       -v, --verbose
	      Prints labels identifying each field being printed.

ENVIRONMENT

       SCONS_LIB_DIR
	      Specifies  the directory that contains the SCons Python module directory (e.g. /home/aroach/scons-src-0.01/src/engine).  on the com-
	      mand line.

SEE ALSO

       scons, scons User Manual, scons Design Document, scons source code.

AUTHORS

       Steven Knight <knight at baldmt dot com>

								  September 2011						       SCONSIGN(1)
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