simon/Bash

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# bash

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* log everything to a file:

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```

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#!/bin/bash

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(

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...

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) 2>&1 | tee -a file

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```

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* more subshells may potentially be needed:

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```

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#!/bin/bash

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((

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...

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) 2>&1) | tee -a file

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```

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* create a file from a heredoc:

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```

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cat << EOF > /tmp/yourfilehere

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These contents will be written to the file.

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This line is indented.

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EOF

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```

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* find files holding a mountpoint open:

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```

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$ dmsetup info -c | grep root

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data-root 254 8 L--w 1 1 0 LVM-C6c8ojMf4YLaSZearY2kTlKbL23Hue9RFUByBbzCncyPWemQGMz9EnmHyNjfJdxy

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$ lsof | grep "254,8"

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```

simon / Bash

simon revised this gist 1 month ago · 01d5a52

		@@ -0,0 +1,38 @@
1	+	# bash
2	+
3	+	* log everything to a file:
4	+
5	+	```
6	+	#!/bin/bash
7	+	(
8	+	...
9	+	) 2>&1 \| tee -a file
10	+	```
11	+
12	+	* more subshells may potentially be needed:
13	+
14	+	```
15	+	#!/bin/bash
16	+	((
17	+	...
18	+	) 2>&1) \| tee -a file
19	+	```
20	+
21	+	* create a file from a heredoc:
22	+
23	+	```
24	+	cat << EOF > /tmp/yourfilehere
25	+
26	+	These contents will be written to the file.
27	+	This line is indented.
28	+	EOF
29	+	```
30	+
31	+	* find files holding a mountpoint open:
32	+
33	+	```
34	+	$ dmsetup info -c \| grep root
35	+
36	+	data-root 254 8 L--w 1 1 0 LVM-C6c8ojMf4YLaSZearY2kTlKbL23Hue9RFUByBbzCncyPWemQGMz9EnmHyNjfJdxy
37	+	$ lsof \| grep "254,8"
38	+	```