hexdump, logger, netstat, n, nm, pdfgrep: move to common (#6549)

pages/common/hexdump.md

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+# hexdump
+
+> An ASCII, decimal, hexadecimal, octal dump.
+> More information: <https://manned.org/hexdump>.
+
+- Print the hexadecimal representation of a file:
+
+`hexdump {{file}}`
+
+- Display the input offset in hexadecimal and its ASCII representation in two columns:
+
+`hexdump -C {{file}}`
+
+- Display the hexadecimal representation of a file, but interpret only n bytes of the input:
+
+`hexdump -C -n{{number_of_bytes}} {{file}}`

pages/common/logger.md

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+# logger
+
+> Add messages to syslog (/var/log/syslog).
+> More information: <https://manned.org/logger>.
+
+- Log a message to syslog:
+
+`logger {{message}}`
+
+- Take input from stdin and log to syslog:
+
+`echo {{log_entry}} | logger`
+
+- Send the output to a remote syslog server running at a given port. Default port is 514:
+
+`echo {{log_entry}} | logger --server {{hostname}} --port {{port}}`
+
+- Use a specific tag for every line logged. Default is the name of logged in user:
+
+`echo {{log_entry}} | logger --tag {{tag}}`
+
+- Log messages with a given priority. Default is `user.notice`. See `man logger` for all priority options:
+
+`echo {{log_entry}} | logger --priority {{user.warning}}`

pages/common/n.md

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+# n
+
+> Tool to manage multiple node versions.
+
+- Install a given version of node. If the version is already installed, it will be activated:
+
+`n {{version}}`
+
+- Display installed versions and interactively activate one of them:
+
+`n`
+
+- Remove a version:
+
+`n rm {{version}}`
+
+- Execute a file with a given version:
+
+`n use {{version}} {{file.js}}`
+
+- Output binary path for a version:
+
+`n bin {{version}}`

pages/common/netstat.md

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+# netstat
+
+> Displays network-related information such as open connections, open socket ports, etc.
+> More information: <https://man7.org/linux/man-pages/man8/netstat.8.html>.
+
+- List all ports:
+
+`netstat --all`
+
+- List all listening ports:
+
+`netstat --listening`
+
+- List listening TCP ports:
+
+`netstat --tcp`
+
+- Display PID and program names:
+
+`netstat --program`
+
+- List information continuously:
+
+`netstat --continuous`
+
+- List routes and do not resolve IP addresses to hostnames:
+
+`netstat --route --numeric`
+
+- List listening TCP and UDP ports (+ user and process if you're root):
+
+`netstat --listening --program --numeric --tcp --udp --extend`

pages/common/nm.md

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+# nm
+
+> List symbol names in object files.
+
+- List global (extern) functions in a file (prefixed with T):
+
+`nm -g {{file.o}}`
+
+- List only undefined symbols in a file:
+
+`nm -u {{file.o}}`
+
+- List all symbols, even debugging symbols:
+
+`nm -a {{file.o}}`
+
+- Demangle C++ symbols (make them readable):
+
+`nm --demangle {{file.o}}`

pages/common/pdfgrep.md

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+# pdfgrep
+
+> Search text in PDF files.
+
+- Find lines that match pattern in a PDF:
+
+`pdfgrep {{pattern}} {{file.pdf}}`
+
+- Include file name and page number for each matched line:
+
+`pdfgrep --with-filename --page-number {{pattern}} {{file.pdf}}`
+
+- Do a case-insensitive search for lines that begin with "foo" and return the first 3 matches:
+
+`pdfgrep --max-count {{3}} --ignore-case {{'^foo'}} {{file.pdf}}`
+
+- Find pattern in files with a `.pdf` extension in the current directory recursively:
+
+`pdfgrep --recursive {{pattern}}`
+
+- Find pattern on files that match a specific glob in the current directory recursively:
+
+`pdfgrep --recursive --include {{'*book.pdf'}} {{pattern}}`