Awesome-Mirrors/the-book-of-secret-knowledge
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updated README.md

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- signed-off-by: trimstray <trimstray@gmail.com>
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trimstray 2018-07-23 14:47:54 +02:00
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@ -443,24 +443,34 @@ column -c3 -s " " -t | \
sort -nr | nl | head -n 20 sort -nr | nl | head -n 20
``` ```
###### Empty a file (truncate to 0 size)
```bash
>filename
```
###### Quickly backup a file ###### Quickly backup a file
```bash ```bash
cp filename{,.orig} cp filename{,.orig}
``` ```
###### Empty a file (truncate to 0 size)
```bash
>filename
```
###### Delete all files in a folder that don't match a certain file extension ###### Delete all files in a folder that don't match a certain file extension
```bash ```bash
rm !(*.foo|*.bar|*.baz) rm !(*.foo|*.bar|*.baz)
``` ```
###### Pass multi-line string to a file
```bash
# cat >filename ... - overwrite file
# cat >>filename ... - append to file
cat > filename << __EOF__
data data data
__EOF__
```
###### Edit a file on a remote host using vim ###### Edit a file on a remote host using vim
```bash ```bash
@ -1039,6 +1049,12 @@ dd <dd_params> status=progress
watch --interval 5 killall -USR1 dd watch --interval 5 killall -USR1 dd
``` ```
###### Redirect output to a file with dd
```bash
echo "string" | dd of=filename
```
<a name="http-https"><b>HTTP/HTTPS</b></a> <a name="http-https"><b>HTTP/HTTPS</b></a>
##### Tool: [curl](https://curl.haxx.se) ##### Tool: [curl](https://curl.haxx.se)