cloud engineer
Here’s how to read Bash variables from another file.
Contents of config.sh
#!/bin/bash var1='thisisvariableone' var2='thisisvariabletwo' |
#!/bin/bash var1='thisisvariableone' var2='thisisvariabletwo'
Call config.sh from another script.
#!/bin/bash source config.sh echo var1 echo var2 |
#!/bin/bash source config.sh echo var1 echo var2
This is extremely helpful if you have multiple scripts using a common variable. You just to update one file instead of multiple files. All the other scripts will read and pick up the same variables from a config file. You can use this to setup your global variables.
How to split a large file.
split -b 500MB httpd.log ll -lh total 1.9G -rw-r--r-- 1 root root 954M Mar 25 12:35 httpd.log -rw-r--r-- 1 root root 477M Mar 25 12:38 xaa -rw-r--r-- 1 root root 477M Mar 25 12:38 xab |
split -b 500MB httpd.log ll -lh total 1.9G -rw-r--r-- 1 root root 954M Mar 25 12:35 httpd.log -rw-r--r-- 1 root root 477M Mar 25 12:38 xaa -rw-r--r-- 1 root root 477M Mar 25 12:38 xab
Split with an output file.
split -b 200M httpd.log split.log ll -lh total 1.9G -rw-r--r-- 1 root root 954M Mar 25 12:35 httpd.log -rw-r--r-- 1 root root 200M Mar 25 12:52 split.logaa -rw-r--r-- 1 root root 200M Mar 25 12:52 split.logab -rw-r--r-- 1 root root 200M Mar 25 12:52 split.logac -rw-r--r-- 1 root root 200M Mar 25 12:52 split.logad -rw-r--r-- 1 root root 154M Mar 25 12:52 split.logae |
split -b 200M httpd.log split.log ll -lh total 1.9G -rw-r--r-- 1 root root 954M Mar 25 12:35 httpd.log -rw-r--r-- 1 root root 200M Mar 25 12:52 split.logaa -rw-r--r-- 1 root root 200M Mar 25 12:52 split.logab -rw-r--r-- 1 root root 200M Mar 25 12:52 split.logac -rw-r--r-- 1 root root 200M Mar 25 12:52 split.logad -rw-r--r-- 1 root root 154M Mar 25 12:52 split.logae
Linux has tail command. What about Windows? You can use Powershell to tail a file.
Get-Content myLog.log –Wait |
Get-Content myLog.log –Wait
Here’s how to convert multiple files to UTF-8 format.
for file in *.csv; do iconv -f ascii -t utf-8 "$file" -o "${file%.txt}.utf8.csv" done |
for file in *.csv; do iconv -f ascii -t utf-8 "$file" -o "${file%.txt}.utf8.csv" done
You can import the Matrox Monarch HD configuration on boot up from a web page. Go to:
Command Center > Automatic Configuration. Type in URL Address starting with https. Check "Load settings on device reboot." You can either power off the device or hit reset. Holding reset for more than 5 seconds does a factory reset. On next bootup, device will have configuration contained from the remote file. |
Command Center > Automatic Configuration. Type in URL Address starting with https. Check "Load settings on device reboot." You can either power off the device or hit reset. Holding reset for more than 5 seconds does a factory reset. On next bootup, device will have configuration contained from the remote file.