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  • \$\begingroup\$ -t: is useless and you can use number<<<& \$\endgroup\$ Commented Dec 2, 2016 at 2:06
  • \$\begingroup\$ @izabera Yes - thanks - I removed the -t:. However, sed's eval feature runs commands using sh, so bash features like <<< won't work. \$\endgroup\$ Commented Dec 2, 2016 at 17:38
  • \$\begingroup\$ it works fine as long as your sh is bash :P \$\endgroup\$ Commented Dec 2, 2016 at 22:49
  • \$\begingroup\$ @izabera Nope - if bash as started as sh it tries to emulate Posix sh as much as possible, which means that bashisms such as <<< are turned off. GNU sed's eval feature starts commands with /bin/sh -c ... and not /bin/bash -c .... Have you tried this? \$\endgroup\$ Commented Dec 2, 2016 at 23:32
  • \$\begingroup\$ bash never turns off <<<, not even in posix mode \$\endgroup\$ Commented Dec 3, 2016 at 0:13