Select everything between first and last occurrence of same pattern

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# 22  
Old 06-22-2011
Originally Posted by alister
Looks like it's not looping properly. Try the following:
sed -n '/xyz/!d; :top
H; /xyz/ {s/.*//; x; s/\n//; p;}; n;
b top
' rem

If that doesn't work, I'd be curious to know if the script file version works (using the code that begins with #n in a file and executing it with sed's -f option).

Hello Alister,
Neither of the "sed's" working. The above one is giving "infinite number of xyz's in output" and I have to close the terminal to come out.

The sed with -f option has thrown the below error:

/home/ravi>sed -f sed_one rem
sed: /xyz/! d is not a recognized function.

Here , sed_one does have below code:
/home/ravi/>cat sed_one
/xyz/! d
/xyz/ {
b top

# 23  
Old 06-22-2011
Removed : the code was containing an error of logic...

That one should be better :

awk '{A[NR]=$0}/one/{m=x?m:NR;x=NR}END{while(m<=x)print A[m++]}' input

Last edited by ctsgnb; 06-22-2011 at 09:04 AM..
# 24  
Old 06-22-2011
Strange, this:
awk '/one/{f=1;x=NR}f{A[++c]=$0}END{while(++d<x)print A[d]}' input

works fine on a HP-UX machine but not on my Debian box with gawk Smilie
# 25  
Old 06-22-2011

Ah ... forget my code ... there is an error of logic in it (confusing "line number of 'one' pattern" and "total number of line that match the requirement"
(i have just removed that erroneous code from my previous post)

In fact it is because the first occurrence of "one" in my tst file was appearing at the second line so the dift with final NR of the "one" occurrence was -1 ...
NR or NR-1 (x or x-1) doesn't necessary match the number of wanted lines !!!

That code should be fine :
awk '{A[NR]=$0}/one/{m=x?m:NR;x=NR}END{while(m<=x)print A[m++]}' input

Last edited by ctsgnb; 06-22-2011 at 09:22 AM..
# 26  
Old 06-22-2011
Originally Posted by panyam
Hello Alister,
Neither of the "sed's" working.
Hmmm. I know it sounds like the easy way out, but I suspect that your system's sed is broken (at least with respect to POSIX). This is not a complicated sed script, it uses standard syntax, and it works fine on the three different implementations that I tested. I don't have access to a HP-UX system, so I cannot take a deeper look.


Last edited by alister; 06-22-2011 at 09:45 AM..
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