1. The shell gets the configuration from the configuration file
1. Create a new configuration file conf.txt with the following contents:
path='/data/source'
username='myuser'
password='mypassword'
2. Create a new shell file read.sh The content of the file is as follows
eval `cat ./conf.txt`
echo "$username"
echo "$path"
echo "$password"
This will get the contents of the configuration file
Second, split the string and traverse the loop
a="1.1.1" #To
split $a, first store the old separator
OLD_IFS="$IFS" #Set the
separator
IFS="." #The
following will automatically separate
arr=($a) Note: Parentheses Can't lose
echo "arr:" ${arr}
echo "arr length:" ${#arr[@]} #Restore
the original separator
IFS="$OLD_IFS"
3. Dictionary
Uppercase A will report an error. If it is changed to lowercase a, the key can only use numbers
declare -A map=(["sunjun"]="a" ["jason"]="b" ["lee"]="c")
echo ${#map[*]}
#2, take out all the values
echo ${map[@]}
echo ${map[*]}
#3. Take out all keys
echo ${!map[@]}
echo ${!map[*]}