printf tricks
Variable assignment:
printf -v USER_EMAIL $(curl https://jsonplaceholder.typicode.com/comments/1 | jq -r ".email")
echo $USER_EMAILscript to print a formatted table:
#!/bin/bash
# print headers
printf "%-25s %-25s %s\n" ID VALUE TIME
# print whitespace and "tr" it to dashes for header divider
printf "%*s-----\n" 75 | tr ' ' "-"
# print values with standard formatting
for i in $(seq 0 10); do
printf "%-25s %-25s %s\n" $i $(( $i * $i )) "$(date)"
done
# ID VALUE TIME
# --------------------------------------------------------------------------------
# 0 0 Sat Sep 23 09:57:55 CDT 2017
# 1 1 Sat Sep 23 09:57:55 CDT 2017
# 2 4 Sat Sep 23 09:57:55 CDT 2017
# 3 9 Sat Sep 23 09:57:55 CDT 2017
# 4 16 Sat Sep 23 09:57:55 CDT 2017
# 5 25 Sat Sep 23 09:57:55 CDT 2017
# 6 36 Sat Sep 23 09:57:55 CDT 2017
# 7 49 Sat Sep 23 09:57:55 CDT 2017
# 8 64 Sat Sep 23 09:57:55 CDT 2017
# 9 81 Sat Sep 23 09:57:55 CDT 2017
# 10 100 Sat Sep 23 09:57:55 CDT 2017