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The script:

#!/bin/bash

interface=enp4s0

mac_address=$(ip link show $interface | grep ether | awk '{print $2}')


cat > /dev/usb/lp0 <<EOF
SIZE 30 mm,90 mm,CLS,TEXT 200,40,0,90,2,2,"MAC Address of $interface:",TEXT 140,40,0,90,2,2,"$mac_address",PRINT 1,END
>EOF

I am using TSPL language to print to the character device. The problem is that content to be printed has to be in double quotes. So for example TEXT 200,40,0,90,2,2,"Some text to be printed". I also want to embed a variable inside the text.

echo "SIZE 30 mm,90 mm,CLS,TEXT 200,40,0,90,2,2,"MAC Address of $interface:",TEXT 140,40,0,90,2,2,"$mac_address",PRINT 1,END > /dev/usb/lp0 is not working because the double quote nesting is breaking the commands of TSPL.

The error I am getting with heredoc is

warning:here-document at line 8 delimited by end-of-file (wanted `EOF')
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  • 2
    why do you have >EOF and not just EOF to close the heredoc? Commented Aug 11, 2022 at 23:48

1 Answer 1

Reset to default
1

As @thrig suggests, changing >EOF to EOF makes quick work of your issue:

cat > /dev/usb/lp0 <<EOF
SIZE 30 mm,90 mm,CLS,TEXT 200,40,0,90,2,2,"MAC Address of $interface:",TEXT 140,40,0,90,2,2,"$mac_address",PRINT 1,END
EOF

I recommend writing bash scripts in an IDE with good syntax highlighting in the future, VS Code quickly made note of this discrepancy. Cheers!

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  • VS Code does bash syntax highlighting? What extention? Commented Aug 12, 2022 at 0:31
  • I'm pretty sure that is just part of the base software, whenever you open a shell file the file type in the bottom right (by character encoding and line ending) should say "Shell Script" as the autodetected file type, and appropriate highlighting should be applied Commented Aug 12, 2022 at 0:40

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