09-08-2006
How to read a particular line in a file with 500000 records init
I am trying to open a file and check a record. The file has 543267 records and I want to check the record 514455. I am trying to open in vi and go to that line
:514455 but i get the error not enough lines in buffer
How should i overcome this? Please help.
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eof(3tcl) Tcl Built-In Commands eof(3tcl)
__________________________________________________________________________________________________________________________________________________
NAME
eof - Check for end of file condition on channel
SYNOPSIS
eof channelId
_________________________________________________________________
DESCRIPTION
Returns 1 if an end of file condition occurred during the most recent input operation on channelId (such as gets), 0 otherwise.
ChannelId must be an identifier for an open channel such as a Tcl standard channel (stdin, stdout, or stderr), the return value from an
invocation of open or socket, or the result of a channel creation command provided by a Tcl extension.
EXAMPLES
Read and print out the contents of a file line-by-line:
set f [open somefile.txt]
while {1} {
set line [gets $f]
if {[eof $f]} {
close $f
break
}
puts "Read line: $line"
}
Read and print out the contents of a file by fixed-size records:
set f [open somefile.dat]
fconfigure $f -translation binary
set recordSize 40
while {1} {
set record [read $f $recordSize]
if {[eof $f]} {
close $f
break
}
puts "Read record: $record"
}
SEE ALSO
file(3tcl), open(3tcl), close(3tcl), fblocked(3tcl), Tcl_StandardChannels(3tcl)
KEYWORDS
channel, end of file
Tcl 7.5 eof(3tcl)