記号
$ sh app.sh argv1 argv2
| Option | Desc. | Example |
|---|---|---|
| ${$} | PID | n |
| ${PPID} | PPID | n |
| ${#} | Num of Arg | 2 |
| ${1} | ARG 1 | arg1 |
| ${@} | All ARG | argv1 argv2 |
PID of the most recently executed background command
~ sleep 10 &
echo ${!}
[1] 66889
66889
~
sleep 10 &
echo ${!}
演算子
| 比較演算子 | 意味 |
|---|---|
| -eq | a == b |
| -ge | a >= b |
| -gt | a > b |
| -le | a <= b |
| -lt | a < b |
| -ne | a != b |