sed delete match line not work
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From: Rakesh Sharma on 17 Apr 2010 09:17 On Apr 17, 8:25 am, moonhkt <moon...(a)gmail.com> wrote: > On 4æ17æ¥, ä¸å12æ23å, Ed Morton <mortons...(a)gmail.com> wrote: > > > > > On 4/16/2010 11:13 AM, moonhkt wrote: > > > > Hi all > > > > When add for replace next is blank line. Not work. How to fix this > > > problem ? > > >   /^$/ { > > >       N > > >       /^\n$/D > > >   } > > > sed is an excellent tool for simple substitutions on a single line. For anything > > else you should use awk, perl, etc. > > > Now, tell us what you're trying to do, with a small sample input and the > > expected output from that input (not the output some script that didn't work > > gives you as that's not useful), and one of us will show you a very clear, > > simple awk script that does it. > > >    Ed. > > Does sed can substitution/delete as below ? I am read a book, "sed & > awk" , O'Reilly also Perl. > > When using two sed, the result is ok > > sed '/^Delete Database/d >    /^end of message/d >     ' sed.text | sed '/^$/{ >   N >   /^\n$/D >     } >   ' > > Input file > ====== > $ cat sed.text > /* testing_email_body.txt */ > UNIX SILENT cat /phx/src/testing_email_body.txt \> > > end of message > > Delete Database > > line 9 > Output file > ======= > /* testing_email_body.txt */ > UNIX SILENT cat /phx/src/testing_email_body.txt \> > > line 9 you need to be clear about what each command of "sed" does. sed -e ' /^Delete Database/d /^end of message/d /^$/ { $q;N /^\n./P D } ' yourfile
From: Ed Morton on 17 Apr 2010 09:29 On 4/17/2010 8:17 AM, Rakesh Sharma wrote: > On Apr 17, 8:25 am, moonhkt<moon...(a)gmail.com> wrote: >> On 4月17日, 上午12時23分, Ed Morton<mortons...(a)gmail.com> wrote: >> >> >> >>> On 4/16/2010 11:13 AM, moonhkt wrote: >> >>>> Hi all >> >>>> When add for replace next is blank line. Not work. How to fix this >>>> problem ? >>>> /^$/ { >>>> N >>>> /^\n$/D >>>> } >> >>> sed is an excellent tool for simple substitutions on a single line. For anything >>> else you should use awk, perl, etc. >> >>> Now, tell us what you're trying to do, with a small sample input and the >>> expected output from that input (not the output some script that didn't work >>> gives you as that's not useful), and one of us will show you a very clear, >>> simple awk script that does it. >> >>> Ed. >> >> Does sed can substitution/delete as below ? I am read a book, "sed& >> awk" , O'Reilly also Perl. >> >> When using two sed, the result is ok >> >> sed '/^Delete Database/d >> /^end of message/d >> ' sed.text | sed '/^$/{ >> N >> /^\n$/D >> } >> ' >> >> Input file >> ====== >> $ cat sed.text >> /* testing_email_body.txt */ >> UNIX SILENT cat /phx/src/testing_email_body.txt \> >> >> end of message >> >> Delete Database >> >> line 9 >> Output file >> ======= >> /* testing_email_body.txt */ >> UNIX SILENT cat /phx/src/testing_email_body.txt \> >> >> line 9 > > > you need to be clear about what each command of "sed" does. > > sed -e ' > /^Delete Database/d > > /^end of message/d > > /^$/ { > $q;N > /^\n./P > D > } > ' yourfile Rakesh - can you tells us what that does? The OP seems to not understand what I'm asking and I can't figure out what he's trying to do by reading the scripts. Ed.
From: moonhkt on 17 Apr 2010 10:36 On 4æ17æ¥, ä¸å9æ29å, Ed Morton <mortons...(a)gmail.com> wrote: > On 4/17/2010 8:17 AM, Rakesh Sharma wrote: > > > > > On Apr 17, 8:25 am, moonhkt<moon...(a)gmail.com>  wrote: > >> On 4æ17æ¥, ä¸å12æ23å, Ed Morton<mortons...(a)gmail.com>  wrote: > > >>> On 4/16/2010 11:13 AM, moonhkt wrote: > > >>>> Hi all > > >>>> When add for replace next is blank line. Not work. How to fix this > >>>> problem ? > >>>>    /^$/ { > >>>>       N > >>>>       /^\n$/D > >>>>    } > > >>> sed is an excellent tool for simple substitutions on a single line. For anything > >>> else you should use awk, perl, etc. > > >>> Now, tell us what you're trying to do, with a small sample input and the > >>> expected output from that input (not the output some script that didn't work > >>> gives you as that's not useful), and one of us will show you a very clear, > >>> simple awk script that does it. > > >>>    Ed. > > >> Does sed can substitution/delete as below ? I am read a book, "sed& > >> awk" , O'Reilly also Perl. > > >> When using two sed, the result is ok > > >> sed '/^Delete Database/d > >>    /^end of message/d > >>      ' sed.text | sed '/^$/{ > >>   N > >>   /^\n$/D > >>      } > >>   ' > > >> Input file > >> ====== > >> $ cat sed.text > >> /* testing_email_body.txt */ > >> UNIX SILENT cat /phx/src/testing_email_body.txt \> > > >> end of message > > >> Delete Database > > >> line 9 > >> Output file > >> ======= > >> /* testing_email_body.txt */ > >> UNIX SILENT cat /phx/src/testing_email_body.txt \> > > >> line 9 > > > you need to be clear about what each command of "sed" does. > > > sed -e ' > >   /^Delete Database/d > > >   /^end of message/d > > >   /^$/ { > >     $q;N > >     /^\n./P > >     D > >   } > > ' yourfile > > Rakesh - can you tells us what that does? The OP seems to not understand what > I'm asking and I can't figure out what he's trying to do by reading the scripts. > >    Ed. I still want using one sed to output the result. Using two sed for mark sure that sed can remove second blank line. I try below code. sed -e ' /^Delete Database/d /^end of message/d /^$/ { N /^\n$/P D } The output as below, but missing one blank line between line 9 and line 11. /* testing_email_body.txt */ UNIX SILENT cat /phx/src/testing_email_body.txt \> line 3 line 9 line 11 Input $ cat sed.text /* testing_email_body.txt */ UNIX SILENT cat /phx/src/testing_email_body.txt \> line 3 end of message Delete Database XXXXXXXXXX line 9 line 11 Expect Output $ cat sed.text /* testing_email_body.txt */ UNIX SILENT cat /phx/src/testing_email_body.txt \> line 3 line 9 line 11
From: Rakesh Sharma on 17 Apr 2010 13:22 On Apr 17, 7:36 pm, moonhkt <moon...(a)gmail.com> wrote: > On 4æ17æ¥, ä¸å9æ29å, Ed Morton <mortons...(a)gmail.com> wrote: > > > > > On 4/17/2010 8:17 AM, Rakesh Sharma wrote: > > > > On Apr 17, 8:25 am, moonhkt<moon...(a)gmail.com>  wrote: > > >> On 4æ17æ¥, ä¸å12æ23å, Ed Morton<mortons...(a)gmail.com>  wrote: > > > >>> On 4/16/2010 11:13 AM, moonhkt wrote: > > > >>>> Hi all > > > >>>> When add for replace next is blank line. Not work. How to fix this > > >>>> problem ? > > >>>>    /^$/ { > > >>>>       N > > >>>>       /^\n$/D > > >>>>    } > > > >>> sed is an excellent tool for simple substitutions on a single line. For anything > > >>> else you should use awk, perl, etc. > > > >>> Now, tell us what you're trying to do, with a small sample input and the > > >>> expected output from that input (not the output some script that didn't work > > >>> gives you as that's not useful), and one of us will show you a very clear, > > >>> simple awk script that does it. > > > >>>    Ed. > > > >> Does sed can substitution/delete as below ? I am read a book, "sed& > > >> awk" , O'Reilly also Perl. > > > >> When using two sed, the result is ok > > > >> sed '/^Delete Database/d > > >>    /^end of message/d > > >>      ' sed.text | sed '/^$/{ > > >>   N > > >>   /^\n$/D > > >>      } > > >>   ' > > > >> Input file > > >> ====== > > >> $ cat sed.text > > >> /* testing_email_body.txt */ > > >> UNIX SILENT cat /phx/src/testing_email_body.txt \> > > > >> end of message > > > >> Delete Database > > > >> line 9 > > >> Output file > > >> ======= > > >> /* testing_email_body.txt */ > > >> UNIX SILENT cat /phx/src/testing_email_body.txt \> > > > >> line 9 > > > > you need to be clear about what each command of "sed" does. > > > > sed -e ' > > >   /^Delete Database/d > > > >   /^end of message/d > > > >   /^$/ { > > >     $q;N > > >     /^\n./P > > >     D > > >   } > > > ' yourfile > > > Rakesh - can you tells us what that does? The OP seems to not understand what > > I'm asking and I can't figure out what he's trying to do by reading the scripts. > > >    Ed. > > I still want using one sed to output the result. Using two sed for > mark sure that sed can remove second blank line. > > I try below code. > sed -e ' >   /^Delete Database/d >   /^end of message/d >   /^$/ { >    N >    /^\n$/P >      D >   } > > The output as below, but missing one blank line between line 9 and > line 11. > /* testing_email_body.txt */ > UNIX SILENT cat /phx/src/testing_email_body.txt \> > line 3 > > line 9 > line 11 > > Input > $ cat sed.text > /* testing_email_body.txt */ > UNIX SILENT cat /phx/src/testing_email_body.txt \> > line 3 > end of message > > Delete Database XXXXXXXXXX > > line 9 > > line 11 > > Expect Output > $ cat sed.text > /* testing_email_body.txt */ > UNIX SILENT cat /phx/src/testing_email_body.txt \> > line 3 > > line 9 > > line 11 Please copy/paste whatever was provided to you. You are using /^\n$/P in place of /^\n./P They are actually reverse of each other! sed -e ' /^Delete Database/d /^end of message/d /^$/ { $q;N /^\n./P; # you used a DOLLAR in place of a DOT D } ' yourfile Or you could use this: sed -e ' /^Delete Database/d /^end of message/d /./b $q;N /../P;D ' yourfile Rough explanation goes somewhat like this: Till you meet an empty line (empty line == no characters, not even spaces, or tabs) do the following: i) delete line beginning with "Delete Database". ii) delete line beginning with "end of message". iii) any other nonempty line, just print it. when we hit the first empty line, we read in the next line also to do something. only 2 cases can occur EE: empty -> empty. This can be matched by: /^\n$/ Just one character for two empty lines & that's a newline EN: empty -> nonempty. This can be matched by: /^\n./ or /../ Atleast two characters for empty followed by nonempty. For EE we Delete the first empty, & without reading in the next input line, go back to top of script with whatever is remaining in our pattern space (this also is an empty line, remember). so we again hit the /^\n$/{....} code of script & end up reading the next line. This has the effect of compressing multiple empty lines into a single empty line. For EN, we print the empty line (/^\n./P) then Delete it from the pattern space. Now the pattern space is holding the nonempty line. Due to the nature of the D command we reapply the script to whatever remained in the pattern space after we Deleted. This could be very easily captured if you drew a flowchart for this. -- Rakesh
From: moonhkt on 18 Apr 2010 10:47 On 4æ18æ¥, ä¸å1æ22å, Rakesh Sharma <sharma...(a)hotmail.com> wrote: > On Apr 17, 7:36 pm, moonhkt <moon...(a)gmail.com> wrote: > > > > > On 4æ17æ¥, ä¸å9æ29å, Ed Morton <mortons...(a)gmail.com> wrote: > > > > On 4/17/2010 8:17 AM, Rakesh Sharma wrote: > > > > > On Apr 17, 8:25 am, moonhkt<moon...(a)gmail.com>  wrote: > > > >> On 4æ17æ¥, ä¸å12æ23å, Ed Morton<mortons...(a)gmail.com>  wrote: > > > > >>> On 4/16/2010 11:13 AM, moonhkt wrote: > > > > >>>> Hi all > > > > >>>> When add for replace next is blank line. Not work. How to fix this > > > >>>> problem ? > > > >>>>    /^$/ { > > > >>>>       N > > > >>>>       /^\n$/D > > > >>>>    } > > > > >>> sed is an excellent tool for simple substitutions on a single line. For anything > > > >>> else you should use awk, perl, etc. > > > > >>> Now, tell us what you're trying to do, with a small sample input and the > > > >>> expected output from that input (not the output some script that didn't work > > > >>> gives you as that's not useful), and one of us will show you a very clear, > > > >>> simple awk script that does it. > > > > >>>    Ed. > > > > >> Does sed can substitution/delete as below ? I am read a book, "sed& > > > >> awk" , O'Reilly also Perl. > > > > >> When using two sed, the result is ok > > > > >> sed '/^Delete Database/d > > > >>    /^end of message/d > > > >>      ' sed.text | sed '/^$/{ > > > >>   N > > > >>   /^\n$/D > > > >>      } > > > >>   ' > > > > >> Input file > > > >> ====== > > > >> $ cat sed.text > > > >> /* testing_email_body.txt */ > > > >> UNIX SILENT cat /phx/src/testing_email_body.txt \> > > > > >> end of message > > > > >> Delete Database > > > > >> line 9 > > > >> Output file > > > >> ======= > > > >> /* testing_email_body.txt */ > > > >> UNIX SILENT cat /phx/src/testing_email_body.txt \> > > > > >> line 9 > > > > > you need to be clear about what each command of "sed" does. > > > > > sed -e ' > > > >   /^Delete Database/d > > > > >   /^end of message/d > > > > >   /^$/ { > > > >     $q;N > > > >     /^\n./P > > > >     D > > > >   } > > > > ' yourfile > > > > Rakesh - can you tells us what that does? The OP seems to not understand what > > > I'm asking and I can't figure out what he's trying to do by reading the scripts. > > > >    Ed. > > > I still want using one sed to output the result. Using two sed for > > mark sure that sed can remove second blank line. > > > I try below code. > > sed -e ' > >   /^Delete Database/d > >   /^end of message/d > >   /^$/ { > >    N > >    /^\n$/P > >      D > >   } > > > The output as below, but missing one blank line between line 9 and > > line 11. > > /* testing_email_body.txt */ > > UNIX SILENT cat /phx/src/testing_email_body.txt \> > > line 3 > > > line 9 > > line 11 > > > Input > > $ cat sed.text > > /* testing_email_body.txt */ > > UNIX SILENT cat /phx/src/testing_email_body.txt \> > > line 3 > > end of message > > > Delete Database XXXXXXXXXX > > > line 9 > > > line 11 > > > Expect Output > > $ cat sed.text > > /* testing_email_body.txt */ > > UNIX SILENT cat /phx/src/testing_email_body.txt \> > > line 3 > > > line 9 > > > line 11 > > Please copy/paste whatever was provided to you. You are using /^\n$/P > in place of /^\n./P > They are actually reverse of each other! > > sed -e ' >   /^Delete Database/d > >   /^end of message/d > >   /^$/ { >    $q;N >    /^\n./P; #  you used a DOLLAR in place of a DOT >    D >   } > '  yourfile > > Or you could use this: > > sed -e ' >   /^Delete Database/d > >   /^end of message/d > >   /./b > >   $q;N >   /../P;D > ' yourfile > > Rough explanation goes somewhat like this: > Till you meet an empty line (empty line == no characters, not even > spaces, or tabs) do the following: >   i) delete line beginning with "Delete Database". >   ii) delete line beginning with "end of message". >  iii) any other nonempty line, just print it. > > when we hit the first empty line, we read in the next line also to do > something. only 2 cases can > occur > > EE: empty -> empty.     This can be matched by: /^\n$/ Just one > character for two empty lines & that's a newline > EN: empty -> nonempty.   This can be matched by: /^\n./ or /../ > Atleast two characters for empty followed by nonempty. > > For EE we Delete the first empty, & without reading in the next input > line, go back to top of script with whatever is remaining in > our pattern space (this also is an empty line, remember). so we again > hit the /^\n$/{....} code of script & end up reading the next line. > This has the effect of compressing multiple empty lines into a single > empty line. > > For EN, we print the empty line (/^\n./P) then Delete it from the > pattern space. Now the pattern space is holding the nonempty line. Due > to the nature > of the D command we reapply the script to whatever remained in the > pattern space after we Deleted. > > This could be very easily captured if you drew a flowchart for this. > > -- Rakesh Thank for your suggestion. I need something to understanding/testing. But, I test below coding. sed -e ' /^Delete Database/d /^end of message/d /^$/ { $q;N /^\n./P; # you used a DOLLAR in place of a DOT D } ' sed.text Input file /* testing_email_body.txt */ UNIX SILENT cat /phx/src/testing_email_body.txt \> line 3 end of message Delete Database XXXXXXXXXX line 10 line 19 Output file, two blank lines between line 3 and line 10. Suppose, One blank line. $ sed_del.ksh /* testing_email_body.txt */ UNIX SILENT cat /phx/src/testing_email_body.txt \> line 3 line 10 line 19 When Add "line 6" in line 6, The Result is OK. Input file /* testing_email_body.txt */ UNIX SILENT cat /phx/src/testing_email_body.txt \> line 3 end of message line 6 Delete Database XXXXXXXXXX line 10 line 19 $ sed_del.ksh /* testing_email_body.txt */ UNIX SILENT cat /phx/src/testing_email_body.txt \> line 3 line 6 line 10 line 19
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