Print one by one character Post: 302541055

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Top Forums Shell Programming and Scripting Print one by one character Post 302541055 by alister on Friday 22nd of July 2011 09:55:24 AM

07-22-2011

Registered User

Quote:

Originally Posted by radoulov

Code:

s='Hi every one. How are you all ....'

# char by char
while [ ${#s} -gt 0 ]; do
  printf '%s\n' "${s%${s#?}}"
  s=${s#?}
  sleep 2
done  

s='Hi every one. How are you all ....'

# word by word
# the follwoing command will
# reset any positional parameters
# and it does not work if shell word
# splitting is disabled (zsh disables it
# by default)

set -- $s

for w; do
  printf '%s\n' "$w"
  sleep 2
done

Hello, radoulov:

For the sake of novice learners, I am pointing out two spots in your suggestions which make them unsuitable for handling miscellaneous text.

${s%${s#?}}: If there's an asterisk in the text, when the character preceding the asterisk should be output, the asterisk will be printed as well. For example, if the line is '2*3=6', when trying to output 2 by removing '*3=6' using the % shortest suffix removal operator, the asterisk will be forced to match nothing. Output in this instance will be '2*' instead of just '2'.

set -- $s: In the second solution you cannot quote $s since it depends on field splitting. Unfortunately, that also leaves the expansion open to file globbing, leaving the approach vulnerable a few metacharacters. I suppose this could be worked around by toggling a noglob option.

You are probably aware of these things, but, as I said, I mention them mostly for novices unaware of the corner cases.

Regards,
Alister

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