1 2 3 4 5 6 7 8 | U-Boot# if test "${snappy_trial_boot}" = "1"; then echo yes; fi
U-Boot# setenv snappy_trial_boot 1
U-Boot# if test "${snappy_trial_boot}" = "1"; then echo yes; fi
yes
U-Boot# setenv snappy_trial_boot
U-Boot# if test "${snappy_trial_boot}" = "1"; then echo yes; fi
U-Boot# printenv snappy_trial_boot
## Error: "snappy_trial_boot" not defined
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