Looking at the man page for pgrep this isn't a bug. Looks like it is the
default behaviour for backwards compatibility with the original Solaris
version.
NOTES
The process name used for matching is limited to the 15 characters
present in the output of
/proc/pid/stat. Use the -f option to match against the complete command
line, /proc/pid/cmdline.
STANDARDS
pkill and pgrep were introduced in Sun’s Solaris 7. This implementation
is fully compatible.
** Changed in: procps (Ubuntu)
Status: Confirmed => Rejected
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pgrep cannot match some long filenames
https://bugs.launchpad.net/bugs/113096
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