I tried the second command without the hyphen...
ttavare@MitchellLabImage:/imaging/Tamara/Youth/1423$ cat ls l /imaging/Tamara/Youth/1423/Instruct.txt
cat: ls: No such file or directory
cat: l: No such file or directory
.4: .9 18.6: .9 35.9: .9 56.1: .9 73.4: .9 89.6: .9 107.9: .9 131.6: .9 151.9: .9 168.1: .9 191.9: .9 209.1: .9 225.4: .9 248.1: .9 266.4: .9 283.6: .9 301.9: .9 323.1: .9 *
5.9: .9 22.1: .9 39.4: .9 57.6: .9 84.4: .9 100.6: .9 120.9: .9 137.1: .9 154.4: .9 172.6: .9 192.9: .9 211.1: .9 227.4: .9 250.1: .9 268.3: .9 286.6: .9 303.9: .9 322.1: .9 *
.4: .9 20.6: .9 38.9: .9 56.1: .9 74.4: .9 91.6: .9 113.3: .9 130.6: .9 148.9: .9 165.1: .9 181.4: .9 205.1: .9 221.4: .9 238.6: .9 260.4: .9 277.6: .9 299.9: .9 321.1: .9 *
.4: .9 20.6: .9 38.9: .9 55.1: .9 72.4: .9 88.6: .9 115.4: .9 131.6: .9 148.8: .9 166.1: .9 189.9: .9 210.1: .9 227.3: .9 251.1: .9 269.3: .9 287.6: .9 303.9: .9 322.1: .9 *
.4: .9 16.6: .9 34.9: .9 52.1: .9 69.4: .9 87.6: .9 105.9: .9 123.1: .9 140.4: .9 158.6: .9 189.9: .9 206.1: .9 227.9: .9 245.1: .9 263.4: .9 283.6: .9 304.9: .9 321.1: .9 *
.4: .9 18.6: .9 35.8: .9 56.1: .9 77.9: .9 96.1: .9 114.3: .9 134.6: .9 150.8: .9 169.1: .9 185.4: .9 202.6: .9 220.9: .9 243.6: .9 260.9: .9 277.1: .9 294.4: .9 322.1: .9 *
ttavare@MitchellLabImage:/imaging/Tamara/Youth/1423$
