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#!/usr/bin/env bash
#
# The logic in the getpos function is stolen from
# http://stackoverflow.com/a/2575525
# Pass "row" or "col" as an argument to get their positions

getpos ()
{
        exec </dev/tty

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for I in <(ls -1ld /) <(ls -l1d /)
do
        exec 3<"$I" || exec 3<&-;
        echo is:$I
        o=$(cat 0<&3)
        echo $o
done

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# tab: 8

# Bourne/Korn/Horstmann
while ((x == 1))
do    echo foo
      echo bar
done

for ((i=0; i < 10; i++))
do if ((i % 2 == 0))

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# 10
while   ((x == 1))
do
        echo foo
        echo bar
done

for     ((i=0; i < 10; i++))
do
        if      ((i % 2 == 0))

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fn() { 
    ((1,1,1))
    a=(f o o)
}

typeset -fp fn

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fn () { 
        function fn ((1))
        function fn ((1)) 2>/dev/null
}

functions fn

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for i in {1..10}
do 
        bash -c '
                TIMEFORMAT=%3R
                time ( 
                        printf "%d\n" {1..10000} \
                        | while read; do echo $REPLY done > /dev/null;
                )
        '
done \

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% printf '%d\n' {1..10000} | { time a=$(</dev/stdin) ; echo "$a"; } | wc -c

real    0m0.027s
user    0m0.004s
sys 0m0.004s
48894

% printf '%d\n' {1..10000} | { time read -rd '' a; echo "$a"; } | wc -c

real    0m0.041s

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# Nr. 1
p='port:     5432,'
echo ${p//[!0-9]/}

# Nr. 2
IFS=':, ' read -r _ p <<< "port:     5432,"

# Nr. 3
awk -F[,:] '{print $2+0}' <<< "port:     5432,"

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TEST_A=(
        '1a'
        '2a'
        '3a'
)

TEST_B=(
        '1b'
        '2b'
        '3b'