Can we create any check-point feature in shell ? Post: 303035606

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Top Forums UNIX for Beginners Questions & Answers Can we create any check-point feature in shell ? Post 303035606 by RudiC on Wednesday 29th of May 2019 09:19:46 AM

05-29-2019

Registered User

This question has been covered before in these fora; try searching for proposed solutions. This is one of the possible search results.
You could work with - let's call it - "status files". When a function has finished satisfactorily, touch a result file, and skip execution of the function if it exists, like

Code:

bkp ()          { touch ${FUNCNAME[0]}.done; }
logging ()      { touch ${FUNCNAME[0]}.done; }
dply ()         { touch ${FUNCNAME[0]}.done; }
fs_ck ()        { if false; then  touch ${FUNCNAME[0]}.done; else return $?; fi }
for FN in logging fs_ck bkp dply; do [ -f "${FN}.done" ] || { if ! ${FN}; then echo $?; break; fi; };  done

This will execute your functions in the desired order if the result file does not exist. For fs_ck it will fail, won't create the result file, and start over with fs_ck skipping the logging function. Give it a try and report back.

RudiC

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LEARN ABOUT OPENSOLARIS

touch

touch(1B)					     SunOS/BSD Compatibility Package Commands						 touch(1B)

NAME

       touch - change file access and modification times

SYNOPSIS

       /usr/ucb/touch [-acfm] file...

DESCRIPTION

       touch sets the access and modification times of each file to the current time. file is created if it does not already exist.

OPTIONS

       -a    Change the access time of file. Do not change the modification time unless -m is also specified.

       -c    Do not create file if it does not exist.

       -f    Attempt to force the touch in spite of read and write permissions on file.

       -m    Change the modification time of file. Do not change the access time unless -a is also specified.

USAGE

       See largefile(5) for the description of the behavior of touch when encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).

EXIT STATUS

       The following exit values are returned:

       0     touch executed successfully and all requested changes were made.

       >0    An error occurred. touch returns the number of files for which the times could not be successfully modified.

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       touch(1), attributes(5), largefile(5)

SunOS 5.11							    26 Oct 1995 							 touch(1B)