ado@elsie.UUCP (Arthur David Olson) (09/29/89)
A three-part exercise: 1. Write and test an awk script to print all input lines that contain the character 'x'. 2. Write and test an awk script to print all input lines that contain the character '='. 3. Comment on the results. Either "nawk" or "gawk" may be substituted for "awk" above. -- To understand Sun's corporate culture look at the vi source code. Arthur David Olson ado@alw.nih.gov ADO is a trademark of Ampex.
ka@cs.washington.edu (Kenneth Almquist) (10/02/89)
> 2. Write and test an awk script to print all input lines that contain > the character '='. If you write awk '/=/' awk will think that the sequence "/=" is an operator rather than the start of a regular expression. You can avoid this by writing awk '/\=/' Or you can patch awk to handle this case. (Look at the grammar rule that matches a regular expression. This handles a "/" operator. Add an alternative to handle the "/=" operator, which should be similar except that it should do a "yyunput('=');" to cause the equals sign treated as part of the regular expression.) Kenneth Almquist
dg@lakart.UUCP (David Goodenough) (10/02/89)
ado@elsie.UUCP (Arthur David Olson) asks: > A three-part exercise: > > 1. Write and test an awk script to print all input lines that contain > the character 'x'. > 2. Write and test an awk script to print all input lines that contain > the character '='. > 3. Comment on the results. 1. --- cut here --- cut here --- cut here --- cut here --- cut here --- #! /bin/sh awk '{ for (i = 1; i <= length($0); i++) if (substr($0, i, 1) == "x") print $0 }' --- cut here --- cut here --- cut here --- cut here --- cut here --- 2. --- cut here --- cut here --- cut here --- cut here --- cut here --- #! /bin/sh awk '{ for (i = 1; i <= length($0); i++) if (substr($0, i, 1) == "=") print $0 }' --- cut here --- cut here --- cut here --- cut here --- cut here --- 3. Huh? Like the man said, "There's no problems, only solutions" -- dg@lakart.UUCP - David Goodenough +---+ IHS | +-+-+ ....... !harvard!xait!lakart!dg +-+-+ | AKA: dg%lakart.uucp@xait.xerox.com +---+
tad@prism.gatech.EDU (Tad K. Mannes) (10/05/89)
In article <708@lakart.UUCP> dg@lakart.UUCP (David Goodenough) writes: > A three-part exercise: > > 1. Write and test an awk script to print all input lines that contain > the character 'x'. > 2. Write and test an awk script to print all input lines that contain > the character '='. > 3. Comment on the results. > Whats wrong with the following scripts? awk '/\x/' awk '/\=/' That was'nt too difficult... -- Tad K. Mannes Georgia Institute of Technology, Atlanta Georgia, 30332 uucp: ...!{allegra,amd,hplabs,seismo,ut-ngp}!gatech!prism!tad ARPA: tad@prism.gatech.edu