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Full Discussion: To print diamond asterisk pattern based on inputs
Top Forums Shell Programming and Scripting To print diamond asterisk pattern based on inputs Post 303037601 by wisecracker on Wednesday 7th of August 2019 01:58:04 PM
Old 08-07-2019
Fully dash/POSIX shell only compliant.
Uses terminal escape codes for fun.
Code:
#!/usr/local/bin/dash
# DIAMOND.sh
# POSIX compliant, with no input error checking.
# Using terminal escape codes just for fun.

echo "Enter minimum value:"
read -r MIN
echo "Enter maximum value:"
read -r MAX
printf "\033c\n"
STRNG="* "
COUNT=1
STAR="${STRNG}"
HORIZ=34
VERT=4
while [ ${COUNT} -lt ${MIN} ]
do
    STRNG="${STRNG}"'* '
    COUNT=$(( COUNT + 1 ))
done

STAR="${STRNG}"
COUNT=$(( MAX + 1 ))
while [ ${COUNT} -ge ${MIN} ]
do
    printf "%b" "\033["${VERT}";"${HORIZ}"f${STAR}"
    STAR="${STAR}${STRNG}"
    COUNT=$(( COUNT - 1 ))
    HORIZ=$(( HORIZ - MIN ))
    VERT=$(( VERT + 1 ))
done
HORIZ=34
VERT=$(( VERT + MAX - MIN ))
STAR="${STRNG}"
COUNT=$(( MAX + 1 ))
while [ ${COUNT} -ge ${MIN} ]
do
    printf "%b" "\033["${VERT}";"${HORIZ}"f${STAR}"
    STAR="${STAR}${STRNG}"
    COUNT=$(( COUNT - 1 ))
    HORIZ=$(( HORIZ - MIN ))
    VERT=$(( VERT - 1 ))
done
printf "\033[H"

Result OSX 10.14.3, default bash terminal calling dash, values given, 3 MIN, 10 MAX:
Code:
AMIGA:amiga~/Desktop/Code/Shell> 


                                 * * * 
                              * * * * * * 
                           * * * * * * * * * 
                        * * * * * * * * * * * * 
                     * * * * * * * * * * * * * * * 
                  * * * * * * * * * * * * * * * * * * 
               * * * * * * * * * * * * * * * * * * * * * 
            * * * * * * * * * * * * * * * * * * * * * * * * 
         * * * * * * * * * * * * * * * * * * * * * * * * * * * 
            * * * * * * * * * * * * * * * * * * * * * * * * 
               * * * * * * * * * * * * * * * * * * * * * 
                  * * * * * * * * * * * * * * * * * * 
                     * * * * * * * * * * * * * * * 
                        * * * * * * * * * * * * 
                           * * * * * * * * * 
                              * * * * * * 
                                 * * *

 

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LEARN ABOUT SUSE

sg_sync

SG_SYNC(8)							     SG3_UTILS								SG_SYNC(8)

NAME

       sg_sync - send the scsi command synchronize cache

SYNOPSIS

       sg_sync [--count=COUNT] [--group=GROUP] [--help] [--immed] [--lba=LBA] [--sync-nv] [--verbose] [--version] DEVICE

DESCRIPTION

       Send SYNCHRONIZE CACHE (10) command to DEVICE. This command is defined for SCSI block devices (see SBC-2). If successful this command makes
       sure that any blocks whose latest versions are held in (volatile) cache are written to (also termed as "synchronized with") the medium.	If
       the  --sync-nv option is given and the device has a non-volatile cache then any blocks whose latest versions are held in volatile cache are
       written to non-volatile cache.

       If the LBA and COUNT arguments are both zero (their defaults) then all blocks in the cache are synchronized. If LBA is  greater	than  zero
       while  COUNT is zero then blocks in the cache whose addresses are from and including LBA to the highest lba on the device are synchronized.
       If both LBA and COUNT are non zero then blocks in the cache whose addresses lie in the range LBA to LBA+COUNT-1 inclusive are  synchronized
       with the medium.

OPTIONS

       Arguments to long options are mandatory for short options as well.

       -c, --count=COUNT
	      where  COUNT  is	the  number  of  blocks  to  synchronize from and including LBA. Default value is 0. When 0 then all blocks in the
	      (volatile) cache from and including LBA argument to the highest block address are synchronized.

       -g, --group=GROUP
	      where GROUP is the group number which can be between 0 and 31 inclusive.	The default value is 0 . Group numbers are used to  segre-
	      gate data collected within the device. This is a new feature in SBC-2 and can probably be ignored for the time being.

       -h, --help
	      output the usage message then exit.

       -i, --immed
	      sets  the  IMMED	bit  in  the  SYNCHRONIZE CACHE command. This instructs the device, if the format of the command is acceptable, to
	      return a GOOD status immediately rather than wait for the blocks in the (volatile) cache to be synchronized with (i.e.  written  to)
	      the medium (or the non-volatile cache).

       -l, --lba=LBA
	      where  LBA  is  the  lowest  logical block address in the (volatile) cache to synchronize to the medium (or the non-volatile cache).
	      Default value is 0 .

       -s, --sync-nv
	      synchronize the (volatile) cache with the non-volatile cache. Without this option (or if there  is  no  non-volatile  cache  in  the
	      device) the synchronization is with the medium.

       -v, --verbose
	      increase the level of verbosity, (i.e. debug output).

       -V, --version
	      print the version string and then exit.

NOTES

       The  COUNT,  GROUP  and LBA arguments may be followed by one of these multiplicative suffixes: c C *1; w W *2; b B *512; k K KiB *1,024; KB
       *1,000; m M MiB *1,048,576; MB *1,000,000 . This pattern continues for "G", "T" and "P". Also a suffix of the form  "x<n>"  multiplies  the
       leading number by <n>. The "T" and "P" suffixes can only be used for COUNT and LBA.

       Alternatively  numerical  values can be given in hexadecimal preceded by either "0x" or "0X" (or with a trailing "h" or "H"). When hex num-
       bers are given, multipliers cannot be used.

EXIT STATUS

       The exit status of sg_sync is 0 when it is successful. Otherwise see the sg3_utils(8) man page.

AUTHORS

       Written by Douglas Gilbert.

REPORTING BUGS

       Report bugs to <dgilbert at interlog dot com>.

COPYRIGHT

       Copyright (C) 2004-2006 Douglas Gilbert
       This software is distributed under a FreeBSD license. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A  PARTICULAR  PUR-
       POSE.

SEE ALSO

       sg_start(sg3_utils)

sg3_utils-1.22							   December 2006							SG_SYNC(8)
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