can't read "env": variable is array [duplicate]

Question

I got the following error from the TCL interpreter when trying to get the value of env variable:

puts $env
can't read "env": variable is array

How can get the value of a TCL variable if it is an array?

Look here: stackoverflow.com/questions/36081328/array-to-string-in-tcl — VillageTech
– VillageTech, Commented Dec 6, 2019 at 11:00

Jerry · Accepted Answer · 2019-12-06 11:16:26Z

2

parray was introduced in Tcl8.5 and is used to 'puts' arrays:

parray env

Note that you need to provide the array name and not the array variable.

Otherwise, you can use a loop:

foreach {key value} [array get env] {
    puts "env($key) = $value"
}

answered Dec 6, 2019 at 11:16

Jerry

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4 Comments

Donal Fellows Over a year ago

I thought it was around long before that. I remember using it in Tcl 7.4...

Jerry Over a year ago

@DonalFellows I just inferred that from the link in the wiki oops. I'm not really sure for how long it's been around, but if it's from 7.4, then I'm wrong there.

glenn jackman Over a year ago

Plus there are lots more array subcommands. For example: foreach key [array names env] {puts "env($key) = $env($key)"}

Donal Fellows Over a year ago

According to the Tcl changes file (the only way to do code archaeology that far back quickly) it predates 6.5, as the changes for 6.5 document a behaviour change for it (probably a switch to using upvar instead of global) implying that it must've been there before and had users. It's all before my time going that far back...

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