How do I capture the output of the show tech-support details?

Issue the tac-pac bootflash://<filename>command in order to redirect the output of the show techcommand to a file, and then gzip the file.

switch#tac-pac bootflash://showtech.switch1

Issue the copy bootflash://showtech.switch1 tftp://<server IP/<path>command in order to copy the file from bootflash to the TFTP server.

switch#copy bootflash://showtech.switch1 tftp://<server IP/<path>