特殊符号小计1

[root@moban-moban data]# cho tt >> tt.tt 2>&1
[root@moban-moban data]# cat tt.tt
tt
tt
-bash: cho: command not found
[root@moban-moban data]# cho tt > tt.tt 2>>&1
-bash: syntax error near unexpected token `&'
[root@moban-moban data]# cho tt > tt.tt 2>&1
[root@moban-moban data]# cat tt.tt
-bash: cho: command not found
[root@moban-moban data]# echo tt >> tt.tt 2>&1
[root@moban-moban data]# echo tt >> tt.tt 2>&1
[root@moban-moban data]# cat tt.tt
-bash: cho: command not found
tt
tt
[root@moban-moban data]# cho tt > tt.tt 2>&1
[root@moban-moban data]# cho tt > tt.tt 2>&1
[root@moban-moban data]# cat tt.tt
-bash: cho: command not found
[root@moban-moban data]# echo tt >> tt.tt 2>&1
[root@moban-moban data]# echo tt >> tt.tt 2>&1
[root@moban-moban data]# cat tt.tt
-bash: cho: command not found
tt
tt
[root@moban-moban data]# ech tt >> tt.tt 2>&1
[root@moban-moban data]# ech tt >> tt.tt 2>&1
[root@moban-moban data]# cat tt.tt
-bash: cho: command not found
tt
tt
-bash: ech: command not found
-bash: ech: command not found
[root@moban-moban data]# ech &>>tt.tt
[root@moban-moban data]# ech &>>tt.tt
[root@moban-moban data]# echo tt &>>tt.tt
[root@moban-moban data]# echo tt &>>tt.tt
[root@moban-moban data]# cat tt.tt
-bash: cho: command not found
tt
tt
-bash: ech: command not found
-bash: ech: command not found
-bash: ech: command not found
-bash: ech: command not found
tt
tt
[root@moban-moban data]# >tt.tt
[root@moban-moban data]# ech &>>tt.tt
[root@moban-moban data]# ech &>>tt.tt
[root@moban-moban data]# echo tt &>>tt.tt
[root@moban-moban data]# ech &>>tt.tt
[root@moban-moban data]# cat tt.tt
-bash: ech: command not found
-bash: ech: command not found
tt
-bash: ech: command not found