When truss is displaying a string, it will display the character if it is printable and it puts a space between the letters. If the character is not printable is outputs in hex and in this case it will need two positions, so you lose the space.
1B is an escape character. You can see it (maybe) with "man ascii". Octal is a little more common in the unix world. You can convert hex to octal via bc. Quick example:
echo "obase=8;ibase=16;1B" | bc
Those are usually called escape sequences. Once you know that an escape is 33 in octal, you can model this in ksh:
The sleep will delay the printing of your prompt long enough to see what happened. The first and last escape sequences are mysteries to me. The second moves the cursor. The third is an sgr (select graphic rendition) The 1 goes to bold mode. I have no idea what the 31 is supposed to do. It is a nop with my xterm. And this leaves my terminal in bold mode. I had to do a "tput sgr0" to fix it.
But if I was using hpterm instead of xterm, this would not work at all. That is the problem with this sort of thing, you must guess at the user's terminal.
Last edited by Yogesh Sawant; 05-26-2010 at 03:08 AM..
Reason: added code tags
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