GNU/Linux

Bash: Show GIT Remote Origin for each immediate subfolder

 in Bash / GNU/Linux  tagged bash / git / GNU/Linux / howtos / Remote Origin URL by

To print on screen all the immediate subfolders and their GIT Remote Origin URL configuration we used the following command

find . -maxdepth 1 -type d \( ! -name . \) -exec bash -c "cd '{}' && echo '{}' && git config --get remote.origin.url" \;

We used the find general command to get all folders that are in depth 1, in other words all folders that are in the specific folder where we started the search.
In our case we used the dot as the starting folder which means that it will run the find in the same folder as we were navigating in.
We passed as a parameter the -type d to instruct find to show only folders and ignore the files.
The \( ! -name . \) prevents executing the command in current directory by removing it from the result set.
With the results we executed some commands on each.

Specifically, we created a new bash session for each result that navigated in the folder, printed out the name of the matched folder and then print the Remote Origin URL using the command git config --get remote.origin.url

Grep: Print only the words of the line that matched the regular expression, one per line

 in Bash / GNU/Linux  tagged grep / word by 
grep -oh "\w*$YOUR_PATTERN\w*" *

We used the following parameters on our command:

-h, –no-filename : Suppress the prefixing of file names on output. This is the default when there is only  one  file  (or only standard input) to search.
-o, –only-matching : Print  only  the matched (non-empty) parts of a matching line,  with each such part on a separate output line.

Also, we wrapped out pattern with the \w* that matches  all word-constituent characters on either side. The * character states that it should find 0 or more of those characters in the pattern to match.

Bash: Determine state of file

 in Bash / GNU/Linux  tagged bash / executable / exist / file / folder / not empty / readable / writable by

Following you will find some tests one can perform on a file to identify its state

Check if file $FILE does not exist

if [ ! -f "$FILE" ]; then
    echo "File $FILE does not exist";
fi

Check if file $FILE exists and is a directory

if [ -d "$FILE" ]; then
    echo "File $FILE exists and is a directory";
fi

Check if file $FILE exists and is a regular file (not a directory)

if [ -f "$FILE" ]; then
    echo "File $FILE exists and is a regular file (not a directory)";
fi

Check if file $FILE exists, we do not know what type it is (if it is a directory, socket, node, etc.)

if [ -e "$FILE" ]; then
    echo "File $FILE exists, we do not know what type it is (if it is a directory, socket, node, etc.)";
fi

Check if file $FILE exists and is a symbolic link

if [ -L "$FILE" ]; then
    echo "File $FILE exists and is a symbolic link";
fi

Check if file $FILE exists and is a socket

if [ -S "$FILE" ]; then
    echo "File $FILE exists and is a socket";
fi

Check if file $FILE exists and is not empty

if [ -s "$FILE" ]; then
    echo "File $FILE exists and is not empty";
fi

Check if file $FILE exists and is readable

if [ -r "$FILE" ]; then
    echo "File $FILE exists and is readable";
fi

Check if file $FILE exists and is writable

if [ -w "$FILE" ]; then
    echo "File $FILE exists and is writable";
fi

Check if file $FILE exists and is executable

if [ -x "$FILE" ]; then
    echo "File $FILE exists and is executable";
fi

Bash: How to iterate over associative array and print all key/value pairs

 in Bash / GNU/Linux  tagged associative array / bash / iterate by

The values of an associative array are accessed using the following syntax ${ARRAY[@]}.

To access the keys of an associative array in bash you need to use  an exclamation point right before the name of the array: ${!ARRAY[@]}.

To iterate over the key/value pairs you can do something like the following example

# For every key in the associative array..
for KEY in "${!ARRAY[@]}"; do
  # Print the KEY value
  echo "Key: $KEY"
  # Print the VALUE attached to that KEY
  echo "Value: ${ARRAY[$KEY]}"
done

NOTE: The use of quotes around the array of keys ${!ARRAY[@]} in the for statement (plus the use of @ instead of *) is necessary in case any keys include spaces.