【writeup】Q7 prank

]0;testman@dosukoi: ~/folder1^Gtestman@dosukoi:~/folder1$ ls

0_file.txt   25_file.txt  40_file.txt  56_file.txt  71_file.txt  87_file.txt
10_file.txt  26_file.txt  41_file.txt  57_file.txt  72_file.txt  88_file.txt
11_file.txt  27_file.txt  42_file.txt  58_file.txt  73_file.txt  89_file.txt
12_file.txt  28_file.txt  43_file.txt  59_file.txt  74_file.txt  8_file.txt
13_file.txt  29_file.txt  44_file.txt  5_file.txt   75_file.txt  90_file.txt
14_file.txt  2_file.txt   45_file.txt  60_file.txt  76_file.txt  91_file.txt
15_file.txt  30_file.txt  46_file.txt  61_file.txt  77_file.txt  92_file.txt
16_file.txt  31_file.txt  47_file.txt  62_file.txt  78_file.txt  93_file.txt
17_file.txt  32_file.txt  48_file.txt  63_file.txt  79_file.txt  94_file.txt
18_file.txt  33_file.txt  49_file.txt  64_file.txt  7_file.txt   95_file.txt
19_file.txt  34_file.txt  4_file.txt   65_file.txt  80_file.txt  96_file.txt
1_file.txt   35_file.txt  50_file.txt  66_file.txt  81_file.txt  97_file.txt
20_file.txt  36_file.txt  51_file.txt  67_file.txt  82_file.txt  98_file.txt
21_file.txt  37_file.txt  52_file.txt  68_file.txt  83_file.txt  9_file.txt
22_file.txt  38_file.txt  53_file.txt  69_file.txt  84_file.txt  flag.txt
23_file.txt  39_file.txt  54_file.txt  6_file.txt   85_file.txt
24_file.txt  3_file.txt   55_file.txt  70_file.txt  86_file.txt

]0;testman@dosukoi: ~/folder1^Gtestman@dosukoi:~/folder1$ mv flag[TAB].txt 666666