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Full Discussion: How to monitor a command inside shell script
Top Forums Shell Programming and Scripting How to monitor a command inside shell script Post 302490836 by agama on Tuesday 25th of January 2011 08:22:02 PM
Old 01-25-2011
This should get you started. I avoid bash, and have marked the one statement that I know you'll need to change if you wish to use bash over Ksh.

Code:
#!/usr/bin/env ksh

# function that does work to be monitored.  when it is finished
# it deletes the marker file passed as $1
function runme
{
    # tar command would go here
    # some dummy work for easy testing instead of tar command
    typeset i=0
    while (( $i < 50 ))
    do
        ps -elf >> /tmp/out
        i=$(( $i + 1 ))
        sleep 1
    done
    # end of dummy work

    rm $1       # remove marker to indicate done
}

# function to monitor and report every few seconds to the tty
function watch
{
    printf "started watching: %s\n" "$(date)"
    while [[ -f $1 ]]     # keep watching until runme removes the marker ($1)
    do
        # replace /tmp/out with your filename, or pass filename in (better)
        ls -hl /tmp/out | read junk junk junk junk size junk    # WARNING: not bash friendly
        printf "%s: cur size: %-10s\r" "$(date)" "$size"
        sleep 2
    done

    printf "\n"
}

marker=/tmp/marker          # watch function loops until this is gone
>$marker                    # create it
runme $marker &             # start function to do work
watch $marker               # update progress until done

Have fun!
This User Gave Thanks to agama For This Post:
sussus2326
 

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LEARN ABOUT DEBIAN

gd_bof

gd_bof(3)							      GETDATA								 gd_bof(3)

NAME

       gd_bof -- report the start of data in a field

SYNOPSIS

       #include <getdata.h>

       off_t gd_bof(DIRFILE *dirfile, const char *field_code);

DESCRIPTION

       The gd_bof() function queries a dirfile(5) database specified by dirfile and returns the sample number of the beginning-of-field marker for
       the vector field given by field_code.

       The caller should not assume that the beginning-of-field marker falls on a frame boundary.  The beginning-of-field marker  is  never  nega-
       tive.

       For  a RAW field, the beginning-of-field corresponds to the frame offset of that field (see gd_frameoffset(3)).	The beginning-of-field for
       all other vector field type is the same as the beginning-of-field of whichever of its input fields that starts latest.	The  beginning-of-
       field marker for the special field INDEX is always zero.

       The beginning-of-field marker for a field containing no data is in the same location as, or after, its end-of-field marker (see gd_eof(3)).
       For a RAW field, the difference between the locations of the beginning- and end-of-field markers indicates the number of  samples  of  data
       actually stored on disk.

       The dirfile argument must point to a valid DIRFILE object previously created by a call to gd_open(3).

RETURN VALUE

       Upon successful completion, gd_bof() returns the sample number of the end-of-field marker for the indicated field.  On error, it returns -1
       and sets the dirfile error to a non-zero error value.  Possible error values are:

       GD_E_BAD_CODE
	       The field specified by field_code or one of the fields it uses as input was not found in the database.

       GD_E_BAD_DIRFILE
	       The supplied dirfile was invalid.

       GD_E_BAD_REPR
	       The representation suffix specified in field_code, or in one of its inputs was not recognised.

       GD_E_DIMENSION
	       A scalar field was found where a vector field was expected in the definition of field_code or one of its inputs, or else field_code
	       itself specified a scalar field.

       GD_E_RECURSE_LEVEL
	       Too  many levels of recursion were encountered while trying to resolve field_code.  This usually indicates a circular dependency in
	       field specification in the dirfile.

       The dirfile error may be retrieved by calling gd_error(3).  A descriptive error string for the last error encountered can be obtained  from
       a call to gd_error_string(3).

SEE ALSO

       dirfile(5), dirfile-encoding(5), gd_open(3), gd_eof(3), gd_error(3), gd_error_string(3), gd_nframes(3)

Version 0.7.0							  15 October 2010							 gd_bof(3)
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