How do I get a date of yesterday in expect

I write a expect script 1.sh:

#!/usr/bin/expect
set yest [exec `date -d "yesterday" '+%Y%m%d'`]
send_user $yest
exit 1


And run in linux ,use expect -d ./1.sh
But I get this error:

expect -d ./1.sh

expect version 5.44.1.15
executing commands from command file ./1.sh
invalid command name "/bin/date"
while executing
"date -d "yesterday" '+%Y%m%d'"
invoked from within
"set yest [date -d "yesterday" '+%Y%m%d']"


So,how do I fix this.I googled somethings and have no idea.
I find clock to instead date:

clock

date

https://www.tcl.tk/man/tcl8.5/TclCmd/clock.htm


And I get a way to run expect in bash:

#!/bin/bash
expect <<!
## expect code ##
!


Finally use this way to get yesterday string in expect script:

expect script

set yest [clock scan "yesterday"]
set yest1 [clock format $yest -format %Y%m%d]


2 Answers
2

Try this

#!/usr/bin/expect
set yest [ exec /bin/date -d "yesterday" +%Y%m%d]
send_user $yest
exit 1


Try out this way:

For yesterday :

date -d '-1 day' '+%Y%d%m'


For day before yesterday :

date -d '-2 day' '+%Y%d%m'


invalid command name "date"

date -d "yesterday" '+%Y%m%d'

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