Shell Programming and Scripting

awk '
FNR==1          {delete CHGARR                                          # 1. line in file: read in next change file; start with clean CHGARR
                 swath=FILENAME                                         # get sequence number from filename
                 sub (/^.*_/,  "", swath)
                 sub (/\..*$/, "", swath)
                 while (1 == getline LINE < (swath"offb1-Sx.sps"))      # read single line from .sps file,   
                        {split (LINE, TMP)                              # split into TMP array, and
                         CHGARR[TMP[5]]=TMP[1]                          # assign to CHGARR for later comparison
                        }
                }

                {IX = (int($4) int($5))}                                # create index value from 4th and 5th field

IX in CHGARR    {sub ($4, sprintf("%8.2f",  substr(CHGARR[IX], 2, 5)))  # if IX found in CHGARR, replace $4 and $5
                 sub ($5, sprintf("%8.2f3", substr(CHGARR[IX], 7, 5)))  # with resp. substr from CHGARR, FMT: 99999.99    
                }                                                       # add "3" to $5

                {print $0 > FILENAME".new"}                             # print to input filename extended by "new"
                                                                        # could be stdout!
' $(eval echo spread_{$fsw..$lsw}.x01)                                  # generate sequence of file names

offsetDbDir=/temp/
#------------------------------------------------------------------------------------------------------
awk '
FNR==1          {delete CHGARR 
                 swath=FILENAME
                 sub (/^.*_/,  "", swath)
                 sub (/\..*$/, "", swath)
                 while (1 == getline LINE < (find $offsetDbDir/ -type f -iname $swath"offb1-Sx.sps"))
                       {split (LINE, TMP)
                         CHGARR[TMP[5]]=TMP[1]
                        }
                }

                {IX = (int($4) int($5))}

IX in CHGARR    {sub ($4, sprintf("%8.2f",  substr(CHGARR[IX], 2, 5)))
                 sub ($5, sprintf("%8.2f3", substr(CHGARR[IX], 7, 5)))
                }

                {print $0 > FILENAME".new"}' $(eval echo spread_{$fsw..$lsw}.x01)

I got a error division by zero attempted

awk '

awk -v DbDir="$offsetDbDir" '

                 while (1 == getline LINE < (find $offsetDbDir/ -type f -iname $swath"offb1-Sx.sps"))

                 while (1 == get line LINE < (DbDir swath "offb1-Sx.sps"))