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Full Discussion: Remove newline character or join the broken record
Top Forums Shell Programming and Scripting Remove newline character or join the broken record Post 302625941 by ygemici on Wednesday 18th of April 2012 02:09:30 PM
Old 04-18-2012
Quote:
Originally Posted by chidori
I have removed the next statement and trying to understand how the code works.. below i have given i how i have understood this code. please correct me if i am wrong.

Code:
bash-3.00# awk '/{}$/{print}{printf "%s ",$0;}' test.txt

1[|]2[|]3[|]4[|]5[|]6[|]7 [|]a[|]b[|]c[|]d{}
[|]a[|]b[|]c[|]d{} 1[|]2[|]3[|]4[|]sss[|]ss as6[|]7 [|]a[|]b[|]c[|]d{}
[|]a[|]b[|]c[|]d{} 1[|]2[|]dsad3[|]dad 4[|]sdad5[|]6[|]7 [|]a[|]b[|dsad]c[|]dsadd{}
[|]a[|]b[|dsad]c[|]dsadd{}


so here the pattern statement is /{}$/
the action statement is {print} ( This print statement will execute if the pattern matched successfully. else this wont executed )
{printf "%s ",$0;} ( This statement will execute throught the script. it doesnt come under any condition )

Code:
line 1 : 1[|]2[|]3[|]4[|]5[|]6[|]7

the pattern {}$ doesnt match this line so the {print} statement doesnt execute.
But the {printf "%s ",$0;} executes and prints the same line1 as thats the current record in processing.

Now the first line has been read and awk moves on to the next line

Code:
line 2 : [|]a[|]b[|]c[|]d{}

the pattern {}$ does match and {print} statement gets executed.

Now awk should again print the line 2 as there is {printf "%s ",$0;} right ? how does it move to next record ?
Code:
# awk '/{}$/{print}{printf "%s ",$0;}'

first execute [1.LINE]
/{}$/ [ you can think there is a `if` ] the pattern matched successfully then print (with default ORS="\n")
result --> NULL (because 1.line does not match with '{}$')
[ you can think there is an `else` ] print "without newline" (printf ..)
result --> "1[|]2[|]3[|]4[|]5[|]6[|]7 "

second execute [2.LINE]
/{}$/ pattern match then print
result -->[|]a[|]b[|]c[|]d{}

lastresut
"1[|]2[|]3[|]4[|]5[|]6[|]7 "[|]a[|]b[|]c[|]d{}
.............

so it goes on like this..

regards
ygemici
 

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LEARN ABOUT DEBIAN

cdbmake

cdbmake(1)						      General Commands Manual							cdbmake(1)

NAME

       cdbmake - create a constant database

SYNOPSIS

       cdbmake cdb cdb.tmp

DESCRIPTION

       cdbmake reads a series of encoded records from its standard input and writes a constant database to cdb.

       cdbmake	ensures  that  cdb is updated atomically, so programs reading cdb never have to wait for cdbmake to finish.  It does this by first
       writing the database to cdb.tmp and then moving cdb.tmp on top of cdb.  If cdb.tmp already exists, it is destroyed.  The  directories  con-
       taining cdb.tmp and cdb must be writable to cdbmake; they must also be on the same filesystem.

       cdbmake always makes sure that cdb.tmp is safely written to disk before it replaces cdb.  If the input is in a bad format or if cdbmake has
       any trouble writing cdb.tmp to disk, cdbmake complains and leaves cdb alone.

   RECORD FORMAT
       Records are indexed by keys.  A key is a string.  cdb is structured so that another program, starting from a key, can quickly find the rel-
       evant  record.	cdbmake allows several records with the same key, although most readers take only the first record, and cdbmake slows down
       somewhat if there are many records with the same key.

       cdbmake and cdbdump(1) preserve the order of records.

       A record is encoded for cdbmake as +klen,dlen:key->data followed by a newline.  Here klen is the number of bytes in key	and  dlen  is  the
       number of bytes in data.  The end of data is indicated by an extra newline.  For example:

	 +3,5:one->Hello
	 +3,7:two->Goodbye

       key and data may contain any characters, including colons, dashes, newlines, and nulls.

       Keys and data do not have to fit into memory.  A database cannot exceed 4 gigabytes.

       cdb is portable across machines.

SEE ALSO

       cdbdump(1), cdbget(1), cdbstats(1)

																	cdbmake(1)
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