| |
| |
| |
|
Comments:
<pasteling> "ccs" at 70.127.159.246 pasted "csd" (1 line, 2B) at http://sial.org/pbot/17868
<howzee> hi all
<howzee> is there any max limit on the command line arguments?
<twkm> usually, yes.
<howzee> whatz the upper limit?
<twkm> depends on the system.
<twkm> if your system has it: ''getconf ARG_MAX''
<howzee> getconf ARG_MAX
<howzee> 1048320
<howzee> that means?
<twkm> that means that you can have 1048320 bytes in the arguments, including the command name, actual path to the program, and a null byte between each argument, as well as room for the exported environment.
<howzee> how can i modify the same/
<twkm> you cannot.
<howzee> even if I've root privileges?
<twkm> perhaps your system permits it. there is no way to get ksh to change it, ksh just obeys it.
<howzee> i think bash doesn't obey this rule... right?
<howzee> only ksh has the restriction
<twkm> it is a system rule, there is nothing any shell can do to avoid it.
<howzee> but i just found that bash can exceed this limit
<twkm> *shrug*
<twkm> i doubt it can. but you aren't saying much so it is hard to say.
<howzee> ksh has another restriction that any single argument shouldn't exceed 2048 chars?
<howzee> # perl -e 'print "A" x 102480' |xargs echo
<howzee> xargs: A single arg was greater than the max arglist size of 2048 characters
<twkm> that is an xargs issue, not ksh.
<howzee> oops: thanx for the info
<howzee> i just ran the following command from ksh, it worked fine
<howzee> perl -e 'print "A " x 1048321' | xargs echo
<howzee> how come? my system limit is 1048320
<twkm> because more than just those 2 million characters need room.
<twkm> the exported environment, the program name, the full path to the program, a null byte between each argument and environment.
<howzee> 1048320 means the total bytes shouldnt exceed this value, in this case, the argument has exceeded this value
<twkm> right.
<howzee> the command shouldn't work right? as it has overflowed the val
<twkm> xargs breaks apart the input into chunks that are allowed.
<twkm> no, "A " 2 million times can be broken into multiple commands -- that is what xargs does.
<twkm> err, "A " 1 million times.
<howzee> echo `perl -e 'print "A" x 1048400'`
<howzee> this also works fine .. it shouldn't right
<howzee> echo `perl -e 'print "A" x 1048400'` | wc -c
<howzee> 1048401
<twkm> since echo is a builtin command it can exceed the limits, because exec is not involved.
<twkm> $ echo "$(perl -e 'print "a"x1310720')" | wc -c 1310721
<twkm> hmm, silly paste thingy. the 1310721 was the result of the wc -c.
<twkm> $ /usr/bin/echo "$(perl -e 'print "a"x1310720')" | wc -c
<twkm> ksh: /usr/bin/echo: cannot execute [Argument list too long] 0
<howzee> twkm: cool ... thanx a lot !!!
<twkm> sure thing.
<howzee> twkm: i appreciate that ... ur explanation was too good
<twkm> cool.
<howzee> whatz the env variable conntrolling history size in ksh?
<howzee> in bash its HISTSIZE i suppose
<Rado> howzee, have you tried "man ksh"?
<howzee> man page suggests the same variable, HISTSIZE
<howzee> but it is not working
<howzee> i tried setting the value to 0
<payal> hi
<payal> please check this very simple script
<payal> http://pastebin.ca/67741
<payal> even though I have given num -ne -1 instead of $num, it still works - Why?
<payal> anyone ?????
<payal> any ideas?
Return to
#ksh
or
Go to some related
logs:
glibc-intermediate FPA error
php script * grabs urls
besific
compiling sharpconstruct ubuntu
IE XMLHTTPRequest Invalid Syntax
gtkterm package in XUBUNTU
error: System has no support for gtk python interface
#gentoo
wmv vlc fedora win32codecs
vnc grey screen damn small linux
|
|
