how to remove non printing characters
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From: dsids on 3 Oct 2009 09:46 On Oct 3, 4:35 pm, pk <p...(a)pk.invalid> wrote: > Lew Pitcher wrote: > > On October 3, 2009 08:15, in comp.unix.shell, Danish > > (me.linuxad...(a)gmail.com) wrote: > > >> Hi, > > >> Please tell me how to remove the non printing characters from a test > >> file. > > > cat test_file | tr -cd '[:print:]' > > Careful with that one...it will remove newlines! Maybe this: > > tr -cd '[:print:]\n' < test_file Thanks all of you. i got the output from the one pk provided. I gotta try the other ones too.
From: Marcel Bruinsma on 3 Oct 2009 09:46 Am Samstag, 3. Oktober 2009 15:35, Lew Pitcher a écrit : > On October 3, 2009 08:15, in comp.unix.shell, Danish > (me.linuxadmin(a)gmail.com) wrote: ^^^^^ >> Please tell me how to remove the non printing characters >> from a test file. > > cat test_file | tr -cd '[:print:]' Because of the 'linuxadmin' in the OP's address, it might be useful to know that GNU (GNU is *not* UNIX) tr does not conform to IEEE Std 1003.1, and that the character class notation will not necessarily do what is expected. Obviously, under UNIX it will work as expected. -- printf -v email $(echo \ 155 141 162 143 145 154 142 162 165 151 \ 156 163 155 141 100 171 141 150 157 157 056 143 157 155|tr \ \\\\) # Live every life as if it were your last! #
From: pk on 3 Oct 2009 09:44 Kenny McCormack wrote: > In article <3784501.N2KK5ppBuW(a)xkzjympik>, pk <pk(a)pk.invalid> wrote: >>Lew Pitcher wrote: >> >>> On October 3, 2009 08:15, in comp.unix.shell, Danish >>> (me.linuxadmin(a)gmail.com) wrote: >>> >>>> Hi, >>>> >>>> >>>> Please tell me how to remove the non printing characters from a test >>>> file. >>> >>> cat test_file | tr -cd '[:print:]' >> >>Careful with that one...it will remove newlines! Maybe this: >> >>tr -cd '[:print:]\n' < test_file > > The OP said he wanted to remove non-printing characters... Yes true. My suspicion came from the fact that he was trying to use dos2unix to do that, which could suggest the file is mostly a text file with some spurious non-printing characters (other than \n). But you're right, whether \n (and perhaps \t and a few others) should be included among the "non-printing" characters only the OP can tell.
From: dsids on 4 Oct 2009 01:50 On Oct 3, 4:44 pm, pk <p...(a)pk.invalid> wrote: > Kenny McCormack wrote: > > In article <3784501.N2KK5ppBuW(a)xkzjympik>, pk <p...(a)pk.invalid> wrote: > >>Lew Pitcher wrote: > > >>> On October 3, 2009 08:15, in comp.unix.shell, Danish > >>> (me.linuxad...(a)gmail.com) wrote: > > >>>> Hi, > > >>>> Please tell me how to remove the non printing characters from a test > >>>> file. > > >>> cat test_file | tr -cd '[:print:]' > > >>Careful with that one...it will remove newlines! Maybe this: > > >>tr -cd '[:print:]\n' < test_file > > > The OP said he wanted to remove non-printing characters... > > Yes true. My suspicion came from the fact that he was trying to use dos2unix > to do that, which could suggest the file is mostly a text file with some > spurious non-printing characters (other than \n). But you're right, whether > \n (and perhaps \t and a few others) should be included among > the "non-printing" characters only the OP can tell. Hi All, What i wanted was to remove the ^M (carriage return) from the text files in the production server. I went thru the command pk provided and it worked well. I'm sorry I dont have much knowledge about non printing characters to talk about. This all that I can tell you. Regards
From: pk on 4 Oct 2009 07:14
dsids wrote: > Hi All, > > What i wanted was to remove the ^M (carriage return) from the text > files in the production server. I went thru the command pk provided > and it worked well. I'm sorry I dont have much knowledge about non > printing characters to talk about. This all that I can tell you. Then the command you ran removed tabs as well, which might or might not be ok. To only remove carriage returns, you could have done just tr -d '\r' < file |