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/proc/7610/cmdlinecontains NULs, which aren't visible in the terminal but very much existcmdline=( ); while IFS= read -r -d '' piece; do cmdline+=( "$piece" ); done </proc/7610/cmdline; printf '%q ' "${cmdline[@]}"; printf '\n'if you want to write a command-line list out to the terminal for human consumption (or written elsewhere for a shell-compatible parser to read) unambiguously.\u0000, which is\x00or NUL in other words.xargs -0 echo < /proc/pid/cmdline../program "one argument"and./program "one" "argument"; the point ofprintf %qis that it escapes strings with nonprintable characters unambiguously, so you can tell the difference (f/e) between spaces and tabs, or get output that tells you how to escape a non-breaking space in such a way as to reproduce the command line that was run.