Find and replace increament

Shell Programming and Scripting
1

Dears,

Can you help me with the below concern, I need one liner for this.

Input_file.txt

dn: asdf=yyyyyyyyyyyyy426019001711473,ou=multiSCs,dc=btc
asdf: yyyyyyyyyyyyy426019001711473
DSUnitGroup: 1
objectClass: CUDBMultiServiceConsumer

dn: asdf=yyyyyyyyyyyyy426019001711351,ou=multiSCs,dc=btc
asdf: yyyyyyyyyyyyy426019001711351
DSUnitGroup: 3
objectClass: CUDBMultiServiceConsumer

dn: asdf=yyyyyyyyyyyyy426019001711436,ou=multiSCs,dc=btc
asdf: yyyyyyyyyyyyy426019001711436
DSUnitGroup: 8
objectClass: CUDBMultiServiceConsumer

dn: asdf=yyyyyyyyyyyyy426019001711326,ou=multiSCs,dc=btc
asdf: yyyyyyyyyyyyy426019001711326
DSUnitGroup: 16
objectClass: CUDBMultiServiceConsumer

dn: asdf=yyyyyyyyyyyyy426019001710223,ou=multiSCs,dc=btc
asdf: yyyyyyyyyyyyy426019001710223
DSUnitGroup: 6
objectClass: CUDBMultiServiceConsumer

The output should be like below, the should start from DSUnitGroup: 1 and incremented sequentially till it reach a particular count here let us say DSUnitGroup: 8, and once it is reached again it should start from DSUnitGroup: 1.

Output_file.txt

dn: asdf=yyyyyyyyyyyyy426019001711473,ou=multiSCs,dc=btc
asdf: yyyyyyyyyyyyy426019001711473
DSUnitGroup: 1
objectClass: CUDBMultiServiceConsumer

dn: asdf=yyyyyyyyyyyyy426019001711351,ou=multiSCs,dc=btc
asdf: yyyyyyyyyyyyy426019001711351
DSUnitGroup: 2
objectClass: CUDBMultiServiceConsumer

dn: asdf=yyyyyyyyyyyyy426019001711436,ou=multiSCs,dc=btc
asdf: yyyyyyyyyyyyy426019001711436
DSUnitGroup: 3
objectClass: CUDBMultiServiceConsumer

dn: asdf=yyyyyyyyyyyyy426019001711326,ou=multiSCs,dc=btc
asdf: yyyyyyyyyyyyy426019001711326
DSUnitGroup: 4
objectClass: CUDBMultiServiceConsumer

dn: asdf=yyyyyyyyyyyyy426019001710223,ou=multiSCs,dc=btc
asdf: yyyyyyyyyyyyy426019001710223
DSUnitGroup: 5
objectClass: CUDBMultiServiceConsumer

dn: asdf=yyyyyyyyyyyyy426019001710223,ou=multiSCs,dc=btc
asdf: yyyyyyyyyyyyy426019001710223
DSUnitGroup: 6
objectClass: CUDBMultiServiceConsumer

dn: asdf=yyyyyyyyyyyyy426019001710223,ou=multiSCs,dc=btc
asdf: yyyyyyyyyyyyy426019001710223
DSUnitGroup: 7
objectClass: CUDBMultiServiceConsumer

dn: asdf=yyyyyyyyyyyyy426019001710223,ou=multiSCs,dc=btc
asdf: yyyyyyyyyyyyy426019001710223
DSUnitGroup: 8
objectClass: CUDBMultiServiceConsumer

dn: asdf=yyyyyyyyyyyyy426019001710223,ou=multiSCs,dc=btc
asdf: yyyyyyyyyyyyy426019001710223
DSUnitGroup: 1
objectClass: CUDBMultiServiceConsumer

dn: asdf=yyyyyyyyyyyyy426019001710223,ou=multiSCs,dc=btc
asdf: yyyyyyyyyyyyy426019001710223
DSUnitGroup: 2
objectClass: CUDBMultiServiceConsumer

can you help me with the one liner string. to achieve this.

2 
awk '$1 ~ /DSUnitGroup:/ {$NF=((c++ % count) + 1)} 1' count=8 file
1 Like
3

@rdrtx1 thank you for the reply brother, can you also help me in describing what this awk attributes are doing I'm not very sound in this.

4

Like so (assuming you know about the pattern - action pair operation of awk ):

awk '                                   # run awk and open its first parameter, taken as "awk script"
$1 ~ /DSUnitGroup:/                     # if $1 (the first field) matches "DSUnitGroup"
  {$NF=                                 # assign to $NF (the last field) the ---
        (
                (c++                    # --- contents of the (post-incremented, see below) c variable
                 % count                # modulo count variable's contents (8) i.e. 0 - 7
                ) + 1                   # plus 1, i.e. 1 - 8
        )                               # now increment c
  }                                     # end statement for $1 match
1                                       # for 1 = TRUE perform default action (print $0)
'                                       # close awk's first parameter
 count=8 file                           # specify count value and input file