[Syntax]
- string trim string1 char --> 刪除 string1左右char字元.
- 不指定, 則刪除空白無效字元 \t \r \n \s
- string trimleft string1 char --> 刪除 string1左邊含有char字元
- string trimright string chars --> 刪除 string1右邊含有char字元
[ExampleCode 1]
- set text2 "HelloWorldPapa 111 abc 222 PapaWorldHello"
- puts $text2\n
- puts [ string trim $text2 "Hello"]
- puts [ string trimleft $text2 "Hello"]
- puts [ string trimright $text2 "Hello"]
- HelloWorldPapa 111 abc 222 PapaWorldHello
- WorldPapa 111 abc 222 PapaWorld
- World Papa 111 abc 222 PapaWorldHello
- HelloWorldPapa 111 abc 222 PapaWorld
[ExampleCode 2]
Purpose: 取 Linux process ID後, 將之移除.
- set uartRes {
- 1 {ps | grep mke2fs
- 3387 root 0:42 mke2fs -j /dev/sda1
- 3404 root 0:00 grep mke2fs
- v3.7.1.9 tango3[~]# }
- }
- puts $uartRes
- puts "A##############"
- puts [lindex $uartRes 1]
- puts "B##############"
- puts [string trimleft [lindex $uartRes 1] "ps | grep mke2fs\n"]
- puts "C##############"
- puts [string trimright [string trimleft [lindex $uartRes 1] "ps | grep mke2fs\n"] "\n"]
- puts "D##############"
- puts [string range [string trimright [string trimleft [lindex $uartRes 1] "ps | grep mke2fs\n"] "\n"] 0 3]
- puts "F##############"
[Output]
1 {ps | grep mke2fs
3387 root 0:42 mke2fs -j /dev/sda1
3404 root 0:00 grep mke2fs
v3.7.1.9 tango3[~]# }
A##############
ps | grep mke2fs
3387 root 0:42 mke2fs -j /dev/sda1
3404 root 0:00 grep mke2fs
v3.7.1.9 tango3[~]#
B##############
3387 root 0:42 mke2fs -j /dev/sda1
3404 root 0:00 grep mke2fs
v3.7.1.9 tango3[~]#
C##############
3387 root 0:42 mke2fs -j /dev/sda1
3404 root 0:00 grep mke2fs
v3.7.1.9 tango3[~]#
D##############
3387
F##############
[程式拆解]
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