====== grep ======

Es gibt unterschiedliche "grep"s, z.B.:

  /usr/bin/grep
  /usr/xpg4/bin/grep

Die 2. Variante hat **Begrenzung** des Eingabestrings auf **2048** Zeichen.

Beispiel:

<code bash>
# printf "%2047s" 1 | egrep -s 1; print $?
0

# printf "%2048s" 1 | egrep -s 1; print $?
1
</code>

Eine Fehlermeldung kommt leider nicht...

:!: NOTES
  /usr/bin/grep
     Lines are limited only by the size of the available  virtual
     memory.  If  there  is a line with embedded nulls, grep will
     only match up to the first null;  if  it  matches,  it  will
     print the entire line.
 
  /usr/xpg4/bin/grep
     The results are unspecified if  input  files  contain  lines
     longer  than LINE_MAX bytes or contain binary data. LINE_MAX
     is defined in /usr/include/limits.h.

<code c>
grep LINE_MAX /usr/include/limits.h
#define _POSIX2_LINE_MAX                2048
#define LINE_MAX                _POSIX2_LINE_MAX
</code>

----
Stand: 22.10.2009

EOF