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Full Discussion: Getting data with unstable space
Top Forums Shell Programming and Scripting Getting data with unstable space Post 302919797 by Don Cragun on Friday 3rd of October 2014 05:52:05 PM
Old 10-03-2014
Quote:
Originally Posted by kenshinhimura
... ... ...

Don/Franklin

can you explain this? character by character?? Please???

thanks

[CODE]awk '{printf("%s%3d\n", $2, $3)}'
awk '{ printf("%s %*s\n", $2, 2, $3) }'
Code:
sed 's/....\(......\).*/\1/'

Code:
awk '{printf("%s%3d\n", $2, $3)}'

  1. awk: utility to run.
  2. '{printf("%s%3d\n", $2, $3)}': script to be interpreted by awk.
  3. '{ commands }': run the specified commands for each line read from standard input.
  4. printf(format, arg1, arg2): print the specified arguments to standard output according to the formatting specifiers given in format.
  5. "%s": format the next argument ($2 in this case) as a string.
  6. "%3d": format the next argument ($3 in this case) as a 3 character string of decimal digits with leading space fill.
  7. "\n": print a literal <newline> character.
  8. ,: separate arguments in the parameter list of the function.
  9. $2: the 2nd field in the current input line. (By default, awk splits fields by sequences of one or more space and/or tab characters.)
  10. $3: the 3rd field in the current input line.
Code:
awk '{ printf("%s %*s\n", $2, 2, $3) }'

  1. awk: utility to run.
  2. '{printf("%s %*s\n", $2, $3)}': script to be interpreted by awk.
  3. '{ commands }': run the specified commands for each line read from standard input.
  4. printf(format, arg1, arg2): print the specified arguments to standard output according to the formatting specifiers given in format.
  5. "%s": format the next argument ($2 in this case) as a string.
  6. " ": print a literal space character.
  7. "%*s": format a string with width specified by the next argument (2 in this case) as right justified with leading space fill from the next argument ($3 in this case).
  8. "\n": print a literal <newline> character.
  9. ,: separate arguments in the parameter list of the function.
  10. $2: the 2nd field in the current input line.
  11. 2: the integer two.
  12. $3: the 3rd field in the current input line.
Code:
sed 's/....\(......\).*/\1/'

  1. sed: the utility to run.
  2. 's/....\(......\).*/\1/': the sed command to be executed.
  3. s/BRE/replacement/: for each line read from standard input, substitute the string specified by repacement for the string in the input line that matches the basic regular expression specified by BRE.
  4. ....: match any four contiguous characters.
  5. \(......\): match any six contiguous characters and remember them for use as a back reference.
  6. .* match the longest string of zero or more available characters. These three parts of the BRE when concatenated together match the entire input line and remember the 5th through the 10th characters on the line as a back reference.
  7. \1: replace the entire string matched by the BRE with the 1st substring remembered as a back reference.
  8. and print the modified input line.
This User Gave Thanks to Don Cragun For This Post:
kenshinhimura
 

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