Bash script coding

tr -s '[[:blank:]]' '[\n*]' < file |
  while IFS= read -r word; do
    : echo "$word" here
  done

1. what does ##tr -s '[[:blank:]]' '[\n*]'##  do ? What does ##[\n*]## do ?
2.  In ##IFS= read -r word ##, what does IFS do ? Does the ouput from first line feed into the 2nd line and put into variable word ?
3. In tr -cs '[A-Za-z_]' '[\n*]' < file , what does ##  tr -cs '[A-Za-z_]' '[\n*] ## do ?

Tks
AXISHKAsked:
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savoneCommented:
1. what does ##tr -s '[[:blank:]]' '[\n*]'##  do ? What does ##[\n*]## do ?

This line replaces a "blank" space with a newline.  \n is the newline character.

2.  In ##IFS= read -r word ##, what does IFS do ? Does the ouput from first line feed into the 2nd line and put into variable word ?

IFS sets the "field separator", in this case it sets it to blank.  You are correct about the second part.

3. In tr -cs '[A-Za-z_]' '[\n*]' < file , what does ##  tr -cs '[A-Za-z_]' '[\n*] ## do ?

I don't see this in your script, and I am not familiar with the -c option.  -s is typically used when collecting user input, it runs in "silent" mode, meaning typing is not echoed to the screen.  The rest  seems to add a newline after each word.
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AXISHKAuthor Commented:
Tks
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TobiasHolmCommented:
Is this a home work / school test? Looks like it.
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