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Man Pages
eof(n) Tcl Built-In Commands eof(n)
 

eof - Check for end of file condition on channel

eof channelId

 

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.

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"
}

file(n), open(n), close(n), fblocked(n), Tcl_StandardChannels(3)

channel, end of file
7.5 Tcl

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