LDP/LDP/guide/docbook/abs-guide/wh-loopc.sh

#!/bin/bash
# wh-loopc.sh: Count to 10 in a "while" loop.

LIMIT=10                 # 10 iterations.
a=1

while [ "$a" -le $LIMIT ]
do
  echo -n "$a "
  let "a+=1"
done                     # No surprises, so far.

echo; echo

# +=================================================================+

# Now, we'll repeat with C-like syntax.

((a = 1))      # a=1
# Double parentheses permit space when setting a variable, as in C.

while (( a <= LIMIT ))   #  Double parentheses,
do                       #+ and no "$" preceding variables.
  echo -n "$a "
  ((a += 1))             # let "a+=1"
  # Yes, indeed.
  # Double parentheses permit incrementing a variable with C-like syntax.
done

echo

# C and Java programmers can feel right at home in Bash.

exit 0