Note you are outputting to Debug.log, while you should indicate the full path of that file: echo “Time: $(date)” >> /path/to/Debug.log. In general, whenever you want to add timestamp to a log file, you can use: echo “Time: $(date). Some error info.” >> /path/to/your/file.log date will expand to something like Fri Sep 9 12:18:02 CEST … Read more
Awk guesses the type. String “10” is less than string “4” because character “1” comes before “4”. Force a type conversion, using addition of zero: min=`awk ‘BEGIN{a=1000}{if ($1<0+a) a=$1} END{print a}’ mydata.dat` max=`awk ‘BEGIN{a= 0}{if ($1>0+a) a=$1} END{print a}’ mydata.dat`
find -type f -maxdepth 1 -writable
The parameter you give to the sqlite3 program is the database file name. To execute commands from a file, you must redirect the input to that file: $ sqlite3 mydatabase.db < SQLTableTransfer or tell it to read from that file: $ sqlite3 mydatabase.db “.read SQLTableTransfer”
Spaces are not allowed next to the equal sign when declaring aliases. Use alias python=python3 and it should work.
In the example PWD= /bin/pwd, the variable PWD is set to the empty string before executing the command /bin/pwd. The change only takes effect for that line. This can be useful to make a temporary change to a variable for the purposes of running a command, without affecting the original value. Another example of this … Read more
If you tacked the following filter onto the one you already have, then you’d get the output shown below: map(select(.Address | test(“^[0-9]”))) Output: [ { “Address”: “1 Bridge Rd” } ] For robustness, you might like to consider adding ? after the test: map(select(.Address | test(“^[0-9]”)?)) Or, you could combine the two calls to map … Read more
The man page of rm says: -r, -R, –recursive remove directories and their contents recursively This means the flag -r is expecting a directory. But *.xml is not a directory. If you want to remove the all .xml files from current directory recursively below is the command: find . -name “*.xml” -type f|xargs rm -f
There’s no reason to use cat here — it adds no functionality and spawns an unnecessary process. while IFS= read -r line; do echo “a line: $line” done < file To read the content of a file into a variable, use foo=$(<file). (Note that this trims trailing newlines.)
You can use sed to trim it. sed ‘s/^ *//;s/ *$//’ You can test it really easily on a command line by doing: echo -n ” 12 s3c ” | sed ‘s/^ *//;s/ *$//’ && echo c