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document backup functions

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This commit is contained in:
Connor Olding 2021-08-01 07:58:21 -07:00
parent 6cacda28df
commit 19e12cee88
3 changed files with 43 additions and 2 deletions
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14
sh/bak
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@ -4,6 +4,20 @@
# YES_DASH
bak() { ### @-
### backup files by copying each and appending ".bak" to their names.
### this calls itself recursively to avoid clobbering existing backups.
###
### ```
### % touch -d '2001-12-25 16:30:00' butts
### % bak butts
### % touch butts
### % bak butts
### % ls -l
### total 0
### -rw-r--r-- 1 notwa None 0 Aug 1 07:56 butts
### -rw-r--r-- 1 notwa None 0 Dec 25 2001 butts.bak
### -rw-r--r-- 1 notwa None 0 Dec 25 2001 butts.bak.bak
### ```
[ $# -gt 0 ] || { printf "%s\n" "$0: too few arguments" >&2; return 1; }
local ret=0
for f; do

14
sh/baknow
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@ -2,6 +2,20 @@
# YES_ZSH
baknow() { ### @-
### backup a single file by appending its timestamp given by [`now`.](#now)
###
### ```
### $ touch -d '2001-12-25 16:30:00' butts
### $ baknow butts
### $ baknow butts
### cp: overwrite 'butts.2001-12-26_01800000.bak'? n
### $ ls -l
### total 0
### -rw-r--r-- 1 notwa None 0 Dec 25 2001 butts
### -rw-r--r-- 1 notwa None 0 Dec 25 2001 butts.2001-12-26_01800000.bak
### ```
###
### **TODO:** support multiple files at once.
cp -ip "${1:?missing file argument}" "$1.$(now "$1").bak"
}

17
sh/baks
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@ -4,11 +4,24 @@
# YES_BASH
# YES_DASH
: $((SOURCING+=1))
#: $((SOURCING+=1))
#. ~/sh/note # FIXME: don't do this?
: $((SOURCING-=1))
#: $((SOURCING-=1))
baks() { ### @-
### backup files by copying each and appending *the current* date-time,
### irrespective of when the files were modified or created.
###
### ```
### $ touch -d '2001-12-25 16:30:00' butts
### $ baks butts
### $ baks butts
### $ ls -l
### total 0
### -rw-r--r-- 1 notwa None 0 Dec 25 2001 butts
### -rw-r--r-- 1 notwa None 0 Dec 25 2001 butts.21-08-01_14-54-07.bak
### -rw-r--r-- 1 notwa None 0 Dec 25 2001 butts.21-08-01_14-54-09.bak
### ```
local ret=0
for fp; do
local now="$(date -u '+%y-%m-%d_%H-%M-%S')"