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Back to resultsCommand previewVerified 2026-07-23

Trace file-related system calls from a running Linux process

Build a paste-ready command, then review its compatibility and effects before running it.

Fill parameters

Process IDrequired

sudo strace -f -p <process-id> -e trace=%file -s 256

Complete required fields to copy the generated command.

cautionrequires privileges

Compatibility

Linux ptrace

Use on a controlled diagnostic window because tracing a busy process adds overhead.

Operational knowledgereview due 2027-01-19

Requirements

stracestrace must be installed and available on PATH.
Elevated accessReview the exact scope before using an elevated account.

Version support

strace Current supported releasesVerified for linux using posix, bash, zsh syntax; consult compatibility notes for platform-specific differences.

Expected signals

strace: Process 1842 attachedRepresentative successful output; values vary with the selected target and system state.

Known errors

strace: command not foundstrace is missing or is not available on PATH.
Permission deniedThe current identity does not have the required access.

Verifysudo strace -f -p {{pid}} -e trace=%file -s 256Re-run the corresponding read-only inspection and confirm the intended state.Rollback noteNo universal automatic rollback is available. Capture the current state and use the tool-specific recovery procedure before applying changes.

Command breakdown

01sudo

Privilege elevation

Runs the following command with elevated privileges after authorization.

02strace

Command

Runs the strace stage of this one-liner.

03-f

Option

Follows child processes and threads created by the traced process.

04-p

Option

Attaches strace to the process with the following PID.

05<process-id>

Parameter

A value supplied in the Fill parameters section.

06-e

Option

Applies the following syscall trace or return-status filter expression.

07trace=%file

Argument

Passes trace=%file to strace.

08-s

Option

Captures up to the specified number of bytes from printed strings.

09256

Argument

Passes 256 to strace.

Example input

sudo strace -f -p 1842 -e trace=%file -s 256

Example output

strace: Process 1842 attached
[pid 1842] openat(AT_FDCWD, "/etc/app/config.yml", O_RDONLY|O_CLOEXEC) = 9
[pid 1842] newfstatat(AT_FDCWD, "/srv/app/cache", 0x7ffd…, 0) = -1 ENOENT (No such file or directory)

Illustrative output — exact values vary by system and data.

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Official sources

strace documentationofficial