i'm writing a script in expect and want to save the output of an command in a variable. Is that possible? The command is
echo "text here"| base64
i know i can set a variable with "set" but
set var ["echo text here| base64"]
or
set var [ spawn "echo text here| base64"]
doesn't work. With that i'm just saving the string not the output.
The exec command returns the output from a command. That lets you set it into a variable:
set var [exec echo "text here" | base64]
However, you can avoid the echo:
set var [exec base64 << "text here"]
And in Tcl 8.6 you can completely skip running an external program:
set var [binary encode base64 "text here"]
There's also a base64 encoder in Tcllib:
package require base64
set var [base64::encode "text here"]