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Bad substitution when generating plots

On Ubuntu 18.04.3 LTS I get the following error when generating plots (gnuplot is installed)

 # ./fio_runner.sh 
 Running all *.fio tests...
 Report directory exists, archiving using current timestamp: 1569912026
 Log directory exists, archiving using current timestamp: 1569912026
 -e 
 Starting fio test lcs.32k.fio...
 Completed fio test lcs.32k.fio.[100.0%][r=91.4MiB/s,w=144MiB/s][r=2926,w=4599 IOPS][eta 00m:00s]
 -e 
 Starting fio test lcs.64k.fio...
 Completed fio test lcs.64k.fio.[100.0%][r=89.0MiB/s,w=110MiB/s][r=1439,w=1754 IOPS][eta 00m:00s]
 -e 
 Starting fio test stcs.32k.fio...
 Completed fio test stcs.32k.fio.%][r=81.5MiB/s,w=116MiB/s][r=2609,w=3711 IOPS][eta 00m:00s]    
 -e 
 Starting fio test stcs.64k.fio...
 Completed fio test stcs.64k.fio.98.4%][r=90.8MiB/s,w=109MiB/s][r=1453,w=1749 IOPS][eta 00m:01s]
 fio_generate_plots is installed generating svg reports based on fio logs
 ./fio_runner.sh: 86: ./fio_runner.sh: Bad substitution
 ./fio_runner.sh: 87: ./fio_runner.sh: Bad substitution
 mv: cannot stat './logs/reads/*.svg': No such file or directory
 mv: cannot stat './logs/writes/*.svg': No such file or directory

Not a huge deal the app still runs and I get the text output, just thought I'd make a ticket in case you ever glanced at this project again :)

Thanks for the tool, much appreciated!

EDIT:
Ahh, probably because /bin/sh is linked to dash on a DigitalOcean Ubuntu droplet. Changed the shebang to #!/usr/bin/env bash as suggested here and all was well

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