#!/usr/bin/env bash
set -euo pipefail
IFS=$'\n\t'
set -x
Explanation:
#!/usr/bin/env bash: interpret the subsequent lines with bash
set -e: exit immediately with error
Script:
echo 1
not-existing-command
echo 2
Out:
1
not-existing-command: command not found
2
Script:
set -e
echo 1
not-existing-command
echo 2
Out:
1
not-existing-command: command not found
set -u: exit immediately with unbound variable
Script:
echo 1
echo $NOT_EXISTING_VARIABLE
echo 2
Out:
1
2
Script:
set -u
echo 1
echo $NOT_EXISTING_VARIABLE
echo 2
Out:
1
NOT_EXISTING_VARIABLE: unbound variable
set -o pipefail: make errors fall through pipelines
Script:
not-existing-command | sort
echo $?
Out:
not-existing-command: command not found
0
Script:
set -o pipefail
not-existing-command | sort
echo $?
Out:
not-existing-command: command not found
127
IFS=$'\n\t': Set input field separator (default: $' \n\t')
Script:
string="1 2 3"
for i in $string; do
echo "$i"
done
IFS=$'\n\t'
for i in $string; do
echo "$i"
done
Out:
1
2
3
1 2 3
Script:
array=(
"a b"
"c d"
)
for x in ${array[@]}; do
echo "$x"
done
IFS=$'\n\t'
for x in ${array[@]}; do
echo "$x"
done
Out:
a
b
c
d
a b
c d
set -x: print lines as they are executed
Script:
set -x
echo 0
echo 1
Out:
+ echo 0
0
+ echo 1
1