Shell Programming and Scripting

# date '+%D %T'
01/26/11 12:40:56

Jan  26 12:40:56 hostname usba: [ID 912658 kern.info] USB 2.0 device (usb430,a2) operating at full speed (USB 1.x) on USB 2.0 external hub: keyboard@4, hid3 at bus address 5

01/26/11 12:40:56 hostname usba: [ID 912658 kern.info] USB 2.0 device (usb430,a2) operating at full
01/26/11 12:40:56 speed (USB 1.x) on USB 2.0 external hub: keyboard@4, hid3 at bus address 5

awk -v yr=`date '+%Y'` 'BEGIN {
m["Jan"]="01"
m["Feb"]="02"
m["Mar"]="03"
m["Apr"]="04"
m["May"]="05"
m["Jun"]="06"
m["Jul"]="07"
m["Aug"]="08"
m["Sep"]="09"
m["Oct"]="10"
m["Nov"]="11"
m["Dec"]="12"
} 
{dt=m[$1]"/"$2"/"yr FS $3;printf dt FS; l=18;for(i=4;i<=NF;i++){l+=length($i)+1;if(l>100 && flg == 1) {flg=0;l=18;printf RS dt FS $i FS} else {flg=1;printf $i FS }}printf "\n"}' inputfile

awk: syntax error near line 1
awk: bailing out near line 1

awk 
-v yr=`date '+%Y'` # Sets the variable yr to the value current year before execution of the program begins
'BEGIN {
m["Jan"]="01"
m["Feb"]="02"
m["Mar"]="03"
m["Apr"]="04"
m["May"]="05"
m["Jun"]="06"
m["Jul"]="07"
m["Aug"]="08"
m["Sep"]="09"
m["Oct"]="10"
m["Nov"]="11"
m["Dec"]="12"
}              #the BEGIN block is evaluated before awk starts processing the input file, We initialize array "m" with index as month and value as month's number 
{	dt=m[$1]"/"$2"/"yr FS $3; # here $1 = Jan,$2= 26 and $3=12:40:56 as per your input file, store date as per your formate into varibale dt. 
	printf dt FS;  # print date and FS (filed seperator)
	l=18; # here l=18 , length of date and time which we alerady printed.
	for(i=4;i<=NF;i++) # start for loop from field 4
	{
		l+=length($i)+1; # adding length of field and 1 for field seperator
		if(l>100 && flg == 1) # if this condition is true means we already print 100 char.
		{flg=0;l=18;printf RS dt FS $i FS} # reset the flag and length variable and print date time and field on new line 
	else {flg=1;printf $i FS } # condition is false then print field on same line
	} 
printf "\n"}' inputfile