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Thanks vino and grasper! It is in position 11, the first 5 characters are spaces so it looks like it's in position 5.
The sed solutions looks a lot more complicated to me. I figured I had to use $0...

As Don said, your example does not match the specification you gave. Maybe you didn't mean "insert 3 random numbers", but "replace the spaces (at a certain position) by a 3-digit random number"?
...

Changing the 4th and 5th characters on your input lines to 3-digit pseudo-random numbers in the output (as shown in your sample input and output) could be done with something like:
awk '
BEGIN...

If you're saying that only want to add the given name to your file (without checking to see whether or not that name was already in the file, AND you don't need the line where it was added, the way...

The 1 (outside braces) is a true condition, and its default action is {print} (and that is {print $0}).

That depends highly on the contents between the braces. As given, the two samples are identical. Should there be any statements inside the braces that either print something or modify any of the...

Hello hhdzhu,

If I understood correctly your requirement then you wanted to know difference between awk '1;{print "\n"}' Input_file and awk '{print "\n"};1' Input_file.
Off course there is a...

So for number 1, by default the print command within awk prints a new line at the end of the line it is printing. As the line here is blank (nothing enclosed within the quotes) it simply prints a...

Hello hhdzhu,

Welcome to forums, hope you will enjoy learning and sharing knowledge here. Following may help you in same.

awk -vTAB="\t" -vTTAB="\t\t" -vparan=")" -vCHAR1=" ,CHR(48),L,"...

try:
awk '
BEGIN {c["a"]="CHR(32),R,"; c["n"]="CHR(48),L,";}
NF==1 {
print "<?xml version=\"1.0\" encoding=\"GB2312\"?>";
print "<convGrp>";
print " <grpid>" $1 "</grpid>";
print...