pages/common/*: replace unportable shell syntax in command examples

pages/common/comm.md

@@ -19,6 +19,6 @@
 
 `comm -23 {{file1}} {{file2}} > {{file1_only}}`
 
-- Print lines only found in second file, when the files aren't sorted:
+- Print lines only found in the second file, when both files are sorted:
 
-`comm -13 <(sort {{file1}}) <(sort {{file2}})`
+`comm -13 {{path/to/sorted_file1}} {{path/to/sorted_file2}}`

pages/common/dnsx.md

@@ -11,13 +11,13 @@
 
 - Query all the DNS records (A, AAAA, CNAME, NS, TXT, SRV, PTR, MX, SOA, AXFR, CAA):
 
-`dnsx -recon -re <<< {{example.com}}`
+`echo {{example.com}} | dnsx -recon -re`
 
 - Query a specific type of DNS record:
 
 `echo {{example.com}} | dnsx -re -{{a|aaaa|cname|ns|txt|srv|ptr|mx|soa|any|axfr|caa}}`
 
 - Output [r]esponse [o]nly (do not show the queried domain or subdomain):
 
 `echo {{example.com}} | dnsx -ro`
 
@@ -29,7 +29,7 @@
 
 `dnsx -domain {{FUZZ.example.com}} -wordlist {{path/to/wordlist.txt}} -re`
 
 - Brute force DNS records from a list of [d]omains and wordlists, appending [o]utput to a file with [n]o [c]olor codes:
 
 `dnsx -domain {{path/to/domain.txt}} -wordlist {{path/to/wordlist.txt}} -re -output {{path/to/output.txt}} -no-color`
 

pages/common/for.md

@@ -9,7 +9,7 @@
 
 - Iterate over a given range of numbers:
 
-`for {{variable}} in {{{from}}..{{to}}..{{step}}}; do {{echo "Loop is executed"}}; done`
+`for {{variable}} in $(seq {{from}} {{to}} {{step}}); do {{echo "Loop is executed"}}; done`
 
 - Iterate over a given list of files:
 

pages/common/git-filter-repo.md

@@ -2,6 +2,7 @@
 
 > A versatile tool for rewriting Git history.
 > See also: `bfg`.
+> Note: Process substitution (i.e., `<(...)` and `>(...)`) may not be supported in your shell.
 > More information: <https://github.com/newren/git-filter-repo>.
 
 - Replace a sensitive string in all files:

pages/common/ifs.md

@@ -14,7 +14,7 @@
 
 - Reset IFS to default:
 
-`IFS=$' \t\n'`
+`IFS='<Space><Tab><Newline>'`
 
 - Temporarily change the IFS value in a subshell:
 

pages/common/md-to-clip.md

@@ -14,7 +14,7 @@
 
 - Convert a tldr-page file to `stdout`:
 
-`md-to-clip --no-file-save <(echo '{{page-content}}')`
+`md-to-clip --no-file-save < {{path/to/page.md}}`
 
 - Convert tldr-pages files while recognizing additional placeholders from a specific config:
 

pages/common/sops.md

@@ -1,6 +1,7 @@
 # sops
 
 > SOPS (Secrets OPerationS): a simple and flexible tool for managing secrets.
+> Note: Process substitution (i.e., `<(...)` and `>(...)`) may not be supported by your shell.
 > More information: <https://github.com/mozilla/sops>.
 
 - Encrypt a file:

pages/common/tee.md

@@ -1,6 +1,7 @@
 # tee
 
 > Read from `stdin` and write to `stdout` and files (or commands).
+> Note: Process substitution (i.e., `<(...)` and `>(...)`) may not be supported by your shell.
 > More information: <https://www.gnu.org/software/coreutils/tee>.
 
 - Copy `stdin` to each file, and also to `stdout`: