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Updated SC2012 (markdown)

Eisuke Kawashima
2025-07-29 20:51:23 +09:00
parent 3f9c06b6b3
commit 4d27a01f84
1 changed files with 5 additions and 5 deletions
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10
SC2012.md

@@ -27,7 +27,7 @@ numgz=${#gz_files[@]} # Sometimes, you just need a count
Here's an example: Here's an example:
```sh ```console
$ ls -l $ ls -l
total 0 total 0
-rw-r----- 1 me me 0 Feb 5 20:11 foo?bar -rw-r----- 1 me me 0 Feb 5 20:11 foo?bar
@@ -45,7 +45,7 @@ It shows three seemingly identical filenames, and did you spot the time format c
`ls` can usually be replaced by `find` if it's just the filenames, or a count of them, that you're after. Note that if you are using `ls` to get at the contents of a directory, a straight substitution of `find` may not yield the same results as `ls`. Here is an example: `ls` can usually be replaced by `find` if it's just the filenames, or a count of them, that you're after. Note that if you are using `ls` to get at the contents of a directory, a straight substitution of `find` may not yield the same results as `ls`. Here is an example:
``` ```console
$ ls -c1 .snapshot $ ls -c1 .snapshot
rnapdev1-svm_4_05am_6every4hours.2019-04-01_1605 rnapdev1-svm_4_05am_6every4hours.2019-04-01_1605
rnapdev1-svm_4_05am_6every4hours.2019-04-01_2005 rnapdev1-svm_4_05am_6every4hours.2019-04-01_2005
@@ -56,7 +56,7 @@ rnapdev1-svm_4_05am_6every4hours.2019-04-02_1205
snapmirror.1501b4aa-3f82-11e8-9c31-00a098cef13d_2147868328.2019-04-01_190000 snapmirror.1501b4aa-3f82-11e8-9c31-00a098cef13d_2147868328.2019-04-01_190000
``` ```
versus versus
``` ```console
$ find .snapshot -maxdepth 1 $ find .snapshot -maxdepth 1
.snapshot .snapshot
.snapshot/rnapdev1-svm_4_05am_6every4hours.2019-04-02_0005 .snapshot/rnapdev1-svm_4_05am_6every4hours.2019-04-02_0005
@@ -70,7 +70,7 @@ $ find .snapshot -maxdepth 1
You can see two differences here. The first is that the `find` output has the full paths to the found files, relative to the current working directory from which `find` was run whereas `ls` only has the filenames. You may have to adjust your code to not add the directory to the filenames as you process them when moving from `ls` to `find`, or (with GNU find) use `-printf '%P\n'` to print just the filename. You can see two differences here. The first is that the `find` output has the full paths to the found files, relative to the current working directory from which `find` was run whereas `ls` only has the filenames. You may have to adjust your code to not add the directory to the filenames as you process them when moving from `ls` to `find`, or (with GNU find) use `-printf '%P\n'` to print just the filename.
The second difference in the two outputs is that the `find` command includes the searched directory as an entry. This can be eliminated by also using `-mindepth 1` to skip printing the root path, or using a negative name option for the searched directory: The second difference in the two outputs is that the `find` command includes the searched directory as an entry. This can be eliminated by also using `-mindepth 1` to skip printing the root path, or using a negative name option for the searched directory:
``` ```console
$ find .snapshot -maxdepth 1 ! -name .snapshot $ find .snapshot -maxdepth 1 ! -name .snapshot
.snapshot/rnapdev1-svm_4_05am_6every4hours.2019-04-02_0005 .snapshot/rnapdev1-svm_4_05am_6every4hours.2019-04-02_0005
.snapshot/rnapdev1-svm_4_05am_6every4hours.2019-04-02_0405 .snapshot/rnapdev1-svm_4_05am_6every4hours.2019-04-02_0405
@@ -83,7 +83,7 @@ $ find .snapshot -maxdepth 1 ! -name .snapshot
**Note:** If the directory argument to `find` is a fully expressed path (`/home/somedir/.snapshot`), then you should use `basename` on the `-name` filter: **Note:** If the directory argument to `find` is a fully expressed path (`/home/somedir/.snapshot`), then you should use `basename` on the `-name` filter:
``` ```console
$ theDir="$HOME/.snapshot" $ theDir="$HOME/.snapshot"
$ find "$theDir" -maxdepth 1 ! -name "$(basename $theDir)" $ find "$theDir" -maxdepth 1 ! -name "$(basename $theDir)"
/home/matt/.snapshot/rnapdev1-svm_4_05am_6every4hours.2019-04-02_0005 /home/matt/.snapshot/rnapdev1-svm_4_05am_6every4hours.2019-04-02_0005