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tail limit in sunos

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# 1  
Old 05-28-2012
tail limit in sunos
my systems are linux red hat and sunos.

i have files that i tail.

in linux, it seems i can tail as many lines as i want without the tail command hanging.

in sun however, if i tail a huge number of lines, the command just hangs.

my question is, is there a better way to tail a file? something different from a tail -f.

i need to be able to tail x number of lines in a file. how can i do this efficiently in sun and/or linux
# 2  
Old 05-28-2012
Hi.

What is huge to you (and sun)?

Do you know that tail on the sun is not simply positioning the file?

There is a perl version of tail at PPT: Which commands? -- I have not used it, but I have used other command work-alikes from that project.

Best wishes ... cheers, drl
# 3  
Old 05-28-2012
Quote:
Originally Posted by drl
Hi.

What is huge to you (and sun)?

Do you know that tail on the sun is not simply positioning the file?

There is a perl version of tail at PPT: Which commands? -- I have not used it, but I have used other command work-alikes from that project.

Best wishes ... cheers, drl
huge is anything sun stalls on. i originally wanted to tail the last 500,000 lines and redirect to a file.

id rather not use perl in in this case, unless there's a one-liner type of perl command that can do this.
# 4  
Old 05-28-2012
Hi.

Both standard and xpg4 tail versions seem to work for me:
Code:
#!/usr/bin/env bash

# @(#) s1       Demonstrate tail for long segment.

xTAIL=/usr/xpg4/bin/tail
sTAIL=/usr/bin/tail
pTAIL=$HOME/bin/perl-tail
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
cs() { echo "$1" | perl -wp -e '1 while s/^([-+]?\d+)(\d{3})/$1,$2/; ' ; }
C=$HOME/bin/context && [ -f $C ] && $C $sTAIL $xTAIL

pe
FILE=${1-/tmp/100-mb.txt}
lines=$( cs $( wc -l < $FILE) )
chars=$( cs $( wc -c < $FILE) )
pl " Input file $FILE has $lines lines, $chars characters."

# Use standard tail.
TAIL=$sTAIL
pl " Results for tail version $TAIL:"
for i in 1 10 100 100000 200000 500000
do
  n=$( $TAIL -$i $FILE | wc -l )
  if [[ n -eq i ]]
  then
    pe " $TAIL successful for $i lines."
  else
    pe " $TAIL failed for $i lines."
  fi
done

# Use xpg4 tail.
TAIL=$xTAIL
pl " Results for tail version $TAIL:"
for i in 1 10 100 100000 200000 500000
do
  n=$( $TAIL -$i $FILE | wc -l )
  if [[ n -eq i ]]
  then
    pe " $TAIL successful for $i lines."
  else
    pe " $TAIL failed for $i lines."
  fi
done

exit 0

producing:
Code:
% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: SunOS, 5.10, i86pc
Distribution        : Solaris 10 10/08 s10x_u6wos_07b X86
GNU bash 3.00.16
/usr/bin/tail - ( /usr/bin/tail, Jun 8 2006 )
/usr/xpg4/bin/tail - ( local: /usr/xpg4/bin/tail, Jun 8 2006 )


-----
 Input file /tmp/100-mb.txt has 1,777,700 lines, 120,540,400 characters.

-----
 Results for tail version /usr/bin/tail:
 /usr/bin/tail successful for 1 lines.
 /usr/bin/tail successful for 10 lines.
 /usr/bin/tail successful for 100 lines.
 /usr/bin/tail successful for 100000 lines.
 /usr/bin/tail successful for 200000 lines.
 /usr/bin/tail successful for 500000 lines.

-----
 Results for tail version /usr/xpg4/bin/tail:
 /usr/xpg4/bin/tail successful for 1 lines.
 /usr/xpg4/bin/tail successful for 10 lines.
 /usr/xpg4/bin/tail successful for 100 lines.
 /usr/xpg4/bin/tail successful for 100000 lines.
 /usr/xpg4/bin/tail successful for 200000 lines.
 /usr/xpg4/bin/tail successful for 500000 lines.

Best wishes ... cheers, drl
# 5  
Old 05-28-2012
It is important that you provide accurate information because there are limitations on basic unix commands which vary from SunOS version to version.

Please state the exact version of SunOS.

How large is the largest file, and how many records does that file contain?
# 6  
Old 05-28-2012
Quote:
Originally Posted by methyl
It is important that you provide accurate information because there are limitations on basic unix commands which vary from SunOS version to version.

Please state the exact version of SunOS.

How large is the largest file, and how many records does that file contain?
sun 5.10

basically, if i wanted to tail the last 500,000 lines of a file and redirect it to a file, what is the best way to do it?

that should have been my original question.

i need a command that works across both linux and sunos servers. i'm almost certain sed should have a hack for this.
# 7  
Old 05-28-2012
Hi.

For GNU/Linux:
Code:
#!/usr/bin/env bash

# @(#) s1	Demonstrate tail for long segment.

xTAIL=/usr/xpg4/bin/tail
sTAIL=/usr/bin/tail
pTAIL=$HOME/bin/perl-tail
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
cs() { echo "$1" | perl -wp -e '1 while s/^([-+]?\d+)(\d{3})/$1,$2/; ' ; }
C=$HOME/bin/context && [ -f $C ] && $C $sTAIL $xTAIL

pe
FILE=${1-/tmp/100-mb.txt}
lines=$( cs $( wc -l < $FILE) )
chars=$( cs $( wc -c < $FILE) )
pl " Input file $FILE has $lines lines, $chars characters."

# Use standard tail.
TAIL=$sTAIL
pl " Results for tail version $TAIL:"
for i in 1 10 100 100000 200000 500000
do
  n=$( $TAIL -$i $FILE | wc -l )
  if [[ n -eq i ]]
  then
    pe " $TAIL successful for $i lines."
  else
    pe " $TAIL failed for $i lines."
  fi
done
exit

# Use xpg4 tail.
TAIL=$xTAIL
pl " Results for tail version $TAIL:"
for i in 1 10 100 100000 200000 500000
do
  n=$( $TAIL -$i $FILE | wc -l )
  if [[ n -eq i ]]
  then
    pe " $TAIL successful for $i lines."
  else
    pe " $TAIL failed for $i lines."
  fi
done

exit 0

producing:
Code:
% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0.8 (lenny) 
bash GNU bash 3.2.39
/usr/bin/tail tail (GNU coreutils) 6.10
 command "/usr/xpg4/bin/tail" not found.


-----
 Input file /tmp/100-mb.txt has 1,777,700 lines, 120,540,400 characters.

-----
 Results for tail version /usr/bin/tail:
 /usr/bin/tail successful for 1 lines.
 /usr/bin/tail successful for 10 lines.
 /usr/bin/tail successful for 100 lines.
 /usr/bin/tail successful for 100000 lines.
 /usr/bin/tail successful for 200000 lines.
 /usr/bin/tail successful for 500000 lines.

Best wishes ... cheers, drl
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