Tcl

Set a Remote File's Last-Access Time

Demonstrates the Chilkat SFtp.SetLastAccessTimeStr method, which sets a remote file's last-access date and time. The arguments are the remote path (or handle), whether the first argument is a handle, and an RFC 822 formatted date/time string.

Background: Setting the access time explicitly is mainly for faithful restores and mirrors, where you want the copy's metadata to match the original exactly. Note that many servers update the access time on their own whenever a file is read (unless mounted noatime), so a value you set can be overwritten by ordinary access — making this the least durable of the timestamps to control.

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Tcl


load ./chilkat.dll

set success 0

#  Demonstrates the SFtp.SetLastAccessTimeStr method, which sets a remote file's last-access date
#  and time.  The 1st argument is the remote path (or handle), the 2nd (bIsHandle) indicates
#  which, and the 3rd is an RFC 822 formatted date/time string.

set sftp [new_CkSFtp]

#  Connect, authenticate, and initialize the SFTP subsystem.
set port 22
set success [CkSFtp_Connect $sftp "sftp.example.com" $port]
if {$success == 0} then {
    puts [CkSFtp_lastErrorText $sftp]
    delete_CkSFtp $sftp
    exit
}

#  Normally you would not hard-code the password in source.  You should instead obtain it
#  from an interactive prompt, environment variable, or a secrets vault.
set password "mySshPassword"

set success [CkSFtp_AuthenticatePw $sftp "mySshLogin" $password]
if {$success == 0} then {
    puts [CkSFtp_lastErrorText $sftp]
    delete_CkSFtp $sftp
    exit
}

set success [CkSFtp_InitializeSftp $sftp]
if {$success == 0} then {
    puts [CkSFtp_lastErrorText $sftp]
    delete_CkSFtp $sftp
    exit
}

#  The 1st argument is a path, so bIsHandle is 0.
set bIsHandle 0
set dateTimeStr "Fri, 10 Jul 2026 20:15:30 -0600"
set success [CkSFtp_SetLastAccessTimeStr $sftp "subdir/report.pdf" $bIsHandle $dateTimeStr]
if {$success == 0} then {
    puts [CkSFtp_lastErrorText $sftp]
    delete_CkSFtp $sftp
    exit
}

puts "Last-access time set."

CkSFtp_Disconnect $sftp

delete_CkSFtp $sftp