22 lines
459 B
Bash
Executable File
22 lines
459 B
Bash
Executable File
#!/bin/bash
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#
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# ex1.bash: Advent2020 game, day 3/game 1.
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CMD=${0##*/}
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XMOVE=3 # 3 right
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declare -i xpos=0 ypos=0 count=0 linelen=0 modpos=0
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read -r line # ignore 1st line
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while read -r line; do
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(( ypos++ ))
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(( xpos += XMOVE )) # move right
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(( linelen = ${#line} ))
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(( modpos = (xpos % linelen) ))
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[[ ${line:modpos:1} = \# ]] && ((count++))
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done
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printf "%s : lines:%d pos=%d found:%d\n" "$CMD" $ypos $xpos $count
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exit 0
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