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@@ -20,7 +20,7 @@ breadcrumbs:
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#### Debian
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- Nobody user and group: `nobody:nogroup`
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-- List of default groups: (SystemGroups (Debian Wiki))[https://wiki.debian.org/SystemGroups#Other_System_Groups]
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+- List of default groups: [SystemGroups (Debian Wiki)](https://wiki.debian.org/SystemGroups#Other_System_Groups)
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- Release info file: `/etc/debian_version`
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#### RHEL
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@@ -34,6 +34,20 @@ breadcrumbs:
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## Commands
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+### Executables:
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+
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+- Show type and info: `file <executable>`
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+- Show library dependencies (for glibc): `ldd <executable>`
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+ - It lists shared library file names and memory location to map it to, or "statically linked" if no dynamic dependencies.
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+ - Alternatively, run the executable with envvar `LD_TRACE_LOADED_OBJECTS=1` set instruct glibc to print dependencies and exit. This is basically how `ldd` works internally, but with more options.
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+ - Warning: This might execute the program if not using glibc.
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+- Show printable character strings in the executable: `strings -a <executable>`
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+- Run application and show dynamic library calls: `ltrace <executable> [args]`
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+ - ltrace will output the trace to STDERR, so consider adding `>/dev/null` to make the program itself more quiet.
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+- Strip the symbol table and debug info from an executable: `strip <executable>`
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+ - Without certain options, it will still keep some useful info in the file.
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+- Rebuild the symbol table for a statically linked executable: See `gensymtab`.
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+
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### File Systems and Logical Volume Managers
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- Partition disk: `gdisk <dev>` or `fdisk <dev>`
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@@ -56,7 +70,7 @@ breadcrumbs:
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- With setuid permission bit: `find / -perm /4000`
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- Recursive search and replace: `find <dir> \( -type d -name .git -prune \) -o -type f -print0 | xargs -0 sed -i 's/123/456/g'`
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- `-type d -name .git -prune` skips `.git` directories and can be excluded outside of git repos.
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-- Usage:
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+- Space usage:
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- `du -sh <dirs>`
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- K4DirStat (GUI) (package `k4dirstat`)
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- Shred files:
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@@ -127,7 +141,7 @@ breadcrumbs:
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- Show USB devices: `lsusb`
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- Show CPUs: `lscpu`
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-### Installations and Packages
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+### Software Installation
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#### APT (Debian)
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Nordstrand