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That is true, birei, but only for the GNU date. The POSIX specification of the date command doesn't include this option.

It is possible to use the UNIX time, which is the number of seconds since...

@birei, if you change file{1,2}.txt to file[12].txt it will work in any shell instead of just bash/ksh93..

a slight mod:

awk -F\| 'NR == FNR {i[$1, $2] = $3; next} i[$1, $2] && i[$1, $2] < $5 { print $1, $2, $4 }' OFS='|' file2 file1

it will print the lines which starts with a number ...
one more in awk ..

$ awk '/^[0-9]/ {print $0}' infile

In case you are interested in writing the most portable sed possible, using a semicolon after a branch command is not portable. With that syntax, the script may not work with most implementations. ...

It doesn't know where the source code is so most of the debugging information's missing. Try gdb -d /path/to/source

Also make sure your makefile didn't strip the debugging information out of it...

You can gather it in one substitution command :
sed 's/[ ]*|[ ]*/|/g' infile

They both give the same result because they both perform the same command substitution and the substituted text does not contain any sh metacharacters.. The only difference is which sh instance...