[[email protected] data]# cho tt >> tt.tt 2>&1
[[email protected] data]# cat tt.tt
tt
tt
-bash: cho: command not found
[[email protected] data]# cho tt > tt.tt 2>>&1
-bash: syntax error near unexpected token `&‘
[[email protected] data]# cho tt > tt.tt 2>&1
[[email protected] data]# cat tt.tt
-bash: cho: command not found
[[email protected] data]# echo tt >> tt.tt 2>&1
[[email protected] data]# echo tt >> tt.tt 2>&1
[[email protected] data]# cat tt.tt
-bash: cho: command not found
tt
tt
[[email protected] data]# cho tt > tt.tt 2>&1
[[email protected] data]# cho tt > tt.tt 2>&1
[[email protected] data]# cat tt.tt
-bash: cho: command not found
[[email protected] data]# echo tt >> tt.tt 2>&1
[[email protected] data]# echo tt >> tt.tt 2>&1
[[email protected] data]# cat tt.tt
-bash: cho: command not found
tt
tt
[[email protected] data]# ech tt >> tt.tt 2>&1
[[email protected] data]# ech tt >> tt.tt 2>&1
[[email protected] data]# cat tt.tt
-bash: cho: command not found
tt
tt
-bash: ech: command not found
-bash: ech: command not found
[[email protected] data]# ech &>>tt.tt
[[email protected] data]# ech &>>tt.tt
[[email protected] data]# echo tt &>>tt.tt
[[email protected] data]# echo tt &>>tt.tt
[[email protected] 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
[[email protected] data]# >tt.tt
[[email protected] data]# ech &>>tt.tt
[[email protected] data]# ech &>>tt.tt
[[email protected] data]# echo tt &>>tt.tt
[[email protected] data]# ech &>>tt.tt
[[email protected] data]# cat tt.tt
-bash: ech: command not found
-bash: ech: command not found
tt
-bash: ech: command not found