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encrypt/decrypt archives

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`@@ -117,6 +117,30 @@ function mkdir.mp3() {`
`117`	`117`	`}`
`118`	`118`	```
`119`	`119`
	`120`	`+## Encrypt/decrypt tar archives`
	`121`	`+`
	`122`	+```
	`123`	`+function tar.encrypt() {`
	`124`	`+ # 1ドル...: files or folders to encrypt`
	`125`	`+ if [ "$#" == 0 ]; then`
	`126`	`+ echo Usage: encrypt \<file\> [\<file\> ...]`
	`127`	`+ return 1`
	`128`	`+ else`
	`129`	`+ tar czvpf - "$@" \| gpg --symmetric --cipher-algo aes256 -o archive.tar.gz.gpg`
	`130`	`+ fi`
	`131`	`+}`
	`132`	`+`
	`133`	`+function tar.decrypt() {`
	`134`	`+ # 1ドル: archive to decrypt`
	`135`	`+ if [ "$#" != 1 ]; then`
	`136`	`+ echo Usage: decrypt \<archive\>`
	`137`	`+ return 1`
	`138`	`+ else`
	`139`	`+ gpg -d 1ドル \| tar xzvf -`
	`140`	`+ fi`
	`141`	`+}`
	`142`	+```
	`143`	`+`
`120`	`144`	`## Appendix: Bash programming reference`
`121`	`145`
`122`	`146`	`<https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html>`

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