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Useful Bash commands and scripts

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Dakusan:
Find all directories that do not contain subdirectories

--- Code: ---find -type d -exec sh -c 'test `find "{}/" -mindepth 1 -type d | wc -l` -eq 0' ';' -print
--- End code ---

Dakusan:
List joined hard links. Same links are separated by tab with a newline between each set.


--- Code: ---find -links +1 | xargs -d"\n" ls -i | perl -e 'foreach $Line (<STDIN>) { @Cols=($Line=~/^\s*(\d+)\s*(.*?)\s*$/); push(@{$Link{$Cols[0]}}, $Cols[1]); } foreach $List (values %Link) { print join("\t", @{$List})."\n"; }'
--- End code ---

Dakusan:
Had a need today to sync file modification timestamps between plex and the actual files. Code is as follows.


--- Code: ---#Dump from sqlite (DB should be in C:\Users\USERNAME\AppData\Local\Plex Media Server\Plug-in Support\Databases
sqlite3 com.plexapp.plugins.library.db 'select file, updated_at from media_parts' | \
sort | uniq | perl -pe 's/\\/\//g' | perl -pe 's/^\w:/\./gi' | perl -pe 's/\|/\t/g' | \
grep -viP '^((DRIVES_TO_IGNORE):|\./(DIRECTORIES_TO_IGNORE)|\|$)' > NAME_CHECKS

#Find all files with their modification timestamps
find -L -type f -printf "%p\t%TY-%Tm-%Td %TH:%TM:%.2TS\n" | sort > FTIMES2

#Filter out unwanted folders and file extensions. I did this as a separate command from the above line to allow filtering without having to run a find on the entire drive again
cat FTIMES2 | grep -vP '\.(md5|torrent|sub|idx|nfo|srt|txt|ssa|log|db|jpg|tbn|sfv|png|cbz|rar|cbr|OTHER_EXTENSIONS)\t' | grep -vP '^./(System Volume Information|\$RECYCLE\.BIN|OTHER_FOLDERS)/' > FTIMES

#After comparing the 2 files and extracting any files that need to be updated, run this regular expression on the data to get touch commands to update the timestamps
^(.*)\t\d\d(\d\d)-(\d\d)-(\d\d) (\d\d):(\d\d):(\d\d)$ => touch -m -t $2$3$4$5$6.$7 "$1"

--- End code ---

Dakusan:
To log all process spawns from a user:
(Fill in USERNAME)

--- Code: ---auditctl -a exit,always -S execve -F uid=USERNAME
--- End code ---

To grep for only these entries, and exclude processes:
(Fill in USERID)
(EXCLUDE_REGEX=A regular expression of process names to exclude. Ex: cron|dovecot)

--- Code: ---ausearch -m ALL | perl -0777 -e 'print grep(/uid=USERID/, grep(!/REGEX/im, split(/^----$/m, <>)))'
--- End code ---
Using user searches (-ua -ue -ui -ul) for ausearch may work too, but I've found it unreliable.

Dakusan:
A function to replace variables in a file that are in the format "VARIABLE_NAME=VARIABLE_DATA". Parameters are: VARIABLE_NAME VARIABLE_DATA FILE_NAME

--- Code: ---function ReplaceVar() {
  REPLACE_VAR_NAME="$1";
  REPLACE_VAR_VAL=$(echo "$2" | perl -e '$V=<STDIN>; chomp($V); print quotemeta($V)' -);
  perl -pi -e "s/(?<=$REPLACE_VAR_NAME[ \t]*=).*$/$REPLACE_VAR_VAL/" "$3"
}
--- End code ---

The real difference between this script and normal command-line-Perl-regex-replaces is that it makes sure values are properly escaped for the search+replace regular expression.

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