Customize string output

-x option makes non-ASCII strings outputted in hexadecimal format (default is octal):

# strace -x ls
......
read(3, "\x7f\x45\x4c\x46\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x3e\x00\x01\x00\x00\x00\x20\x20\x00\x00\x00\x00\x00\x00"..., 832) = 832

-xx makes all strings outputted in hexadecimal format:

# strace -xx ls
......
read(3, "\x7f\x45\x4c\x46\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x3e\x00\x01\x00\x00\x00\x20\x20\x00\x00\x00\x00\x00\x00"..., 832) = 832

Furthermore, -s strsize changes the maximum print size of string (default value is 32). Compare the following outputs:

(1) Using default value:

# strace ls
......
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0  \0\0\0\0\0\0"..., 832) = 832
......

(2) Double the size:

# strace -s 64 ls
......
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0  \0\0\0\0\0\0@\0\0\0\0\0\0\08R\0\0\0\0\0\0\0\0\0\0@\08\0\t\0@\0\26\0\25\0"..., 832) = 832
......

Please note that filenames are not considered strings and are always printed in full.