cathy@ncelvax.UUCP (Cathy Benney) (11/16/89)
Hello. I have been experimenting with "tr", the translate characters command. I am curious to know if tr can substitute from a single character in string 1
to multiple characters in string 2. For example, could "tr" substitute
'\012' (the ascii new line) for '\015\012' (which would be ^M^J). I have been
trying this, using a command like:
tr '\012' '\015\012' < file.1 > file.2
but without any luck. In the command above, tr substitutes ascii 012 for
ascii 015. What I would like is for tr to substitute every 012 with an
012 015. I am a novice in using tr (could you guess?), so my approach may be
off, but I would appreciate any suggestions you may have. Thank you. jik@athena.mit.edu (Jonathan I. Kamens) (11/17/89)
No, the 'tr' command is not capable of changing a single character in the input to multiple characters of output. You could probably do it really easily in perl, though :-) Just another person who is amused by all the perl hackers but hasn't gotten around to learning perl himself, Jonathan Kamens USnail: MIT Project Athena 11 Ashford Terrace jik@Athena.MIT.EDU Allston, MA 02134 Office: 617-253-8495 Home: 617-782-0710
matthew@sunpix.UUCP ( Sun Visualization Products) (11/18/89)
In article <15949@bloom-beacon.MIT.EDU> jik@athena.mit.edu (Jonathan I. Kamens) writes: } } No, the 'tr' command is not capable of changing a single character }in the input to multiple characters of output. } } You could probably do it really easily in perl, though :-) } } Just another person who is amused by all the perl hackers but hasn't }gotten around to learning perl himself, } }Jonathan Kamens USnail: }MIT Project Athena 11 Ashford Terrace }jik@Athena.MIT.EDU Allston, MA 02134 }Office: 617-253-8495 Home: 617-782-0710 True, but this particular problems can be handled by AWK also. awk '{printf ("%s\r\n", $0)}' $* [Note: code written on the fly, and untested - but should work] -- Matthew Lee Stier | Sun Microsystems --- RTP, NC 27709-3447 | "Wisconsin Escapee" uucp: sun!mstier or mcnc!rti!sunpix!matthew | phone: (919) 469-8300 fax: (919) 460-8355 |
merlyn@iwarp.intel.com (Randal Schwartz) (11/20/89)
In article <579@ncelvax.UUCP>, cathy@ncelvax (Cathy Benney) writes: | Hello. I have been experimenting with "tr", the translate characters command. I am curious to know if tr can substitute from a single character in string 1 | to multiple characters in string 2. For example, could "tr" substitute | '\012' (the ascii new line) for '\015\012' (which would be ^M^J). I have been | trying this, using a command like: | tr '\012' '\015\012' < file.1 > file.2 | but without any luck. In the command above, tr substitutes ascii 012 for | ascii 015. What I would like is for tr to substitute every 012 with an | 012 015. I am a novice in using tr (could you guess?), so my approach may be | off, but I would appreciate any suggestions you may have. Thank you. Well, first, stock out-of-the-box 'tr' cannot do it. Tr knows how to delete chars, and replace chars, but not add chars. If you don't have Perl (shame on you!), use sed, as in: % sed 's/$/^M/' <file.1 >file.2 where ^M represents a *real* control-M, which you may have to futz around with the terminal escape chars to get it into the string. For example, under BSD unicies (UNIX plural :-), I can get a ^M by preceding it with a control-V. Another (nicer) solution (you knew it was coming...) is Perl, as in: % perl -pe 's/\012/\015\012/g;' which is typed just as you see it.... no magic chars. (Perl does all the magic. :-) Just another Perl hacker, -- /== Randal L. Schwartz, Stonehenge Consulting Services (503)777-0095 ====\ | on contract to Intel's iWarp project, Hillsboro, Oregon, USA, Sol III | | merlyn@iwarp.intel.com ...!uunet!iwarp.intel.com!merlyn | \== Cute Quote: "Welcome to Oregon... Home of the California Raisins!" ==/
jik@athena.mit.edu (Jonathan I. Kamens) (11/21/89)
In article <1004@greens.UUCP> matthew@greens.UUCP (Matthew Stier - Sun Visualization Products) writes: >In article <15949@bloom-beacon.MIT.EDU> jik@athena.mit.edu (Jonathan I. >Kamens) writes: >} >} No, the 'tr' command is not capable of changing a single character >}in the input to multiple characters of output. > >True, but this particular problems can be handled by AWK also. > >awk '{printf ("%s\r\n", $0)}' $* This will work, yes. However, the original poster asked if tr can substitute multiple characters in the output for one character in the input, and than gave the LF -> CR + LF case as an *example* of where that would be necessary. Awk will work for that one case, but it doesn't address the general problem. The perl script already posted (by Randal Schwartz, I think?) is the best solution I've yet seen to the general problem. Oh, well, off to learn perl.... :-) Jonathan Kamens USnail: MIT Project Athena 11 Ashford Terrace jik@Athena.MIT.EDU Allston, MA 02134 Office: 617-253-8495 Home: 617-782-0710