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Use single brackets for portability with other shells

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This commit is contained in:
Nic Aitch 2017-06-09 09:14:44 -05:00
parent 9ac2ed280c
commit 3b38e6954a
1 changed files with 1 additions and 1 deletions
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2
keyboards/lets_split/rules.mk
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@ -78,7 +78,7 @@ CUSTOM_MATRIX = yes
avrdude: build
ls /dev/tty* > /tmp/1; \
echo "Reset your Pro Micro now"; \
while [[ -z $$USB ]]; do \
while [ -z $$USB ]; do \
sleep 1; \
ls /dev/tty* > /tmp/2; \
USB=`diff /tmp/1 /tmp/2 | grep -o '/dev/tty.*'`; \