sh strlen test

#!/bin/sh

iterations=100

echo 'generating long string...'
long=$(hexdump -n100000 -e '"%x"' /dev/urandom)

echo 'doing != and = unquoted ...'
time sh <<EOF
l='$long'
for i in \$(seq 1 $iterations); do [ \$l != '' -o \$l = '' ]; done
EOF

echo 'doing != and = "quoted" ...'
time sh <<EOF
l='$long'
for i in \$(seq 1 $iterations); do [ "\$l" != '' -o "\$l" = '' ]; done
EOF

echo 'doing -z and -n...'
time sh <<EOF
l='$long'
for i in \$(seq 1 $iterations); do [ -z "\$l" -o -n "\$l" ]; done
EOF

echo 'doing double test [ -n ] || [ -z ] ...'
time sh <<EOF
l='$long'
for i in \$(seq 1 $iterations); do [ -n "\$l" ] || [ -z "\$l" ]; done
EOF

echo 'doing ${#}'
time sh <<EOF
l='$long'
for i in \$(seq 1 $iterations); do [ \${#l} -ne 0 -o \${#l} -eq 0 ]; done
EOF