In AWK, how to insert the value of variable as string at the beginning of the line -

problem solved: due hidden "ctrl-ms". used following awk code remove them:

awk '{ gsub("\r", ""); print $0;}' 

i try insert variable string @ beginning lines match.

the updated example, between &&&&&& lines, bit long needed explaining codes. try extract information each case (with unique case # sp 15 xxxx). want insert case numbers @ front of each lines of diagnosis (using variable of "old_case")

&&&&&&

medical record |                   surgical pathology       pg  1 of 2   pathology report      accession no. sp 15 1111   submitted by:                               date obtained:   specimen (received ): right, right right right  =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=  pathology report         accession no. sp 15 1111  gross description: specimen received in 1 formalin filled container, labeled  microscopic diagnosis:      lung, right right right right, left left           dx:  changes changes changes               no evidence of malignancy                (please see description)  /es/ signature, m.d. 

&&&&&&

my whole script follows:

#! /bin/awk -f  begin {  old_case = "0000"; }  /accession no./  {if (old_case != $7) {old_case = $7; print "acc#",$5,$6,$7 > "output"} else {}};             /microscopic diagnosis:/ {flag=1;next} /\/es\// || /supplementary/ {flag=0} flag {print old_case,$0 > "output"};  end { } 

the result got is:

acc# sp 15 1111 1111       lung, right right right right, left left  1111           dx:  changes changes changes 1111                no evidence of malignancy 1111                (please see description) 1111 1111 

it appears new line breaker added each time variable "old_case" printed. on other hand, if use string "test" instead of variables (with following code)

/microscopic diagnosis:/ {flag=1;next} /\/es\// {flag=0} flag {print "test",$0 > "output"}; 

the result follows, want get:

acc# sp 15 1111  test      lung, right right right right, left left  test          dx:  changes changes changes test               no evidence of malignancy  test               (please see description)  test  test 

i using mac osx 10.9.5