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take a look at 1st field of 1st line of your test [2006], it's one space to the left and this is the cause that shows your script works! change it and see that it doesn't work!

I'm so sorry but believe me I'm trying myself but I'm at the beginning of learning also I'm trying learning Fortran to compare differences between languages, by the way thank you very much, i...

i have a file as below:
? ? ? ? 20060101
DHR ? ? ? ? 20060101 1316 30.90
KOM ? ? ? ? 20060101 1317 7.20
DHR ? ? ? Pg ? 20060101 1316 27.32
DHR ? ? ? Sg ? 20060101 1316 30.52

? ? ? ?...

it doesn't work when i test it the out put file is empty! please test youe script one more time on the original file :<[in_file]>

thanks but there is no output! did you test it on the data that i leaved on previews section?

i have a file as below that has n section [here there is 2 section]:
[in_file]
2006 0101 1236 49.3 L 37.902 48.482 0.0 Teh 5 0.2 2.7LTeh 1
GAP=238 ...

i do your script in my file but it doesn't work!
in_file:

456

654654

6545


your script:

sed 's/^$/###'

and the output was:

456

654654

thank you very much, now i want to print each line which the 5th field of that contains stings "*P,P*" or "*s,S*" {P,S,Pg,Sg,Pn,Sn} without losing blank lines.

but my input file and output file are?
[orginal_file]
2006 0101 1236 49.3 L 37.902 48.482 0.0 Teh 5 0.2 2.7LTeh 1
GAP=238 ...

oh I'm sorry, i forget to tell to you. it's fedora 13.
actually in my original file there is no "###" between section maybe it occur such that problem

thanks alot but there is a little problem:
the output of your script contains the values of 1st field (header must be deleted):
? ? ? ? 20060101
GHG ? ? ? ? 20060101 1316 44.78
LIN ? ? ? ?...

non of them doesn't work!!!:(

how can i insert a string sush as "###" instead of blank lines in a file?
i try this code but it doesn't work!
awk 'NF<1 {$1=="###" ; print$0}' in_file > out_file

because i don't writing scripts with this function, I'm learning awk.

thank you so much, but could you please write an awk, csh or bash script to do that?

I have a file contains 100 section (here i show 2 section of that); i want to replace date from 1st & 2nd field of 1st line of each section (1st line of each section is header and the other lines...

i want to print lines in a file that the 1st field of each line has a Date shape such:
yy/mm/dd


or on the other hand contains slash "/" .

stay without change

i have a file contains as below:
[file]:
12 32 qw
21 44 qq
###
11 90 er
88 23 sa
###
i want to add new field with constant string "madd" between 2nd field and 3rd field of each record, so the...

yes after merging the output file must be the same as input files

---------- Post updated at 07:45 AM ---------- Previous update was at 07:39 AM ----------




thanks but there is a problem,...

i have 3 files which contains as below (example):
yy-mm-dd hh:mm:sec lat lon depth mag

[file_1]2006-01-01 23:17:26.80 39.8405 41.8795 2.0 3.3
2006-01-06 00:10:26.80 ...

i have a file contains continues records; i want to separate each section that has the same 1st field by putting ''###''.
[input file]
1 salam_32 tr po
1 sed_po wqu
1 Pdot. food 32
2 eeeelll
2...

well done, thamks a lot:)

i have a file that contains such earthquake data, i want to write an AWK or SED script to input it and fix it (delete each section header delete some field, delete some blank lines and put ###...

lets explain it easy by showing the initial file and desired file:
I've a file such this that contains:
initial_file:
31/12/2011 23:46:08 38.6762 43.689 14.16 Ml 3.1
...