eof manual page - Tcl Built-In Commands

## Tcl/Tk Documentation > Tcl Commands, version 8.6.18 > eof

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### 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, open, close, fblocked, Tcl_StandardChannels

### KEYWORDS

channel, end of file
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