DEMO

sh.sh

#!/usr/bin/sh

A='AAA'
B="$1"

echo "---- env ----"
echo "A = ${A}"

echo "\$\$ = $$"
echo "\$! = $!"
echo "\$? = $?"
echo "\$# = $#"
echo "\$0 = $0"
echo "\$1 = $1"
echo "\$2 = $2"

echo "---- calc ----"

N1=5
N2=3
echo `expr ${N1} + ${N2}`
echo `expr ${N1} - ${N2}`
echo `expr ${N1} \* ${N2}`
echo `expr ${N1} / ${N2}`
echo `expr ${N1} % ${N2}`

echo "---- if ----"
if [ ${B} -eq 1 ];
then
  echo "one"
elif [ ${B} -eq 2 ];
then
  echo "two"
else
  echo "other"
fi

echo "---- for----"

for x in 3 4 7 8
do
  echo "${x}"
done

echo "---- date ----"
echo `date`


echo "---- ls ----"
ls | sort

---- env ----
A = AAA
$$ = 81141
$! = 
$? = 0
$# = 0
$0 = sh.sh
$1 = 
$2 = 
---- calc ----
8
2
15
1
2
---- if ----
other
---- for----
3
4
7
8
---- date ----
Fri May 25 06:44:46 JST 2012
---- ls ----
index.cgi
initial_setup.sh
install_gem_batch.sh
install_plagger.sh
read.sh
sh.sh