nl_command
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Do not mark variables and function which are modified or created for export to the environment of subsequent commands | set +a |
Find regular files under and below /path that match pattern "???-???_[a-zA-Z]*_[0-9]*_*.???" | find /path -type f -name "???-???_[a-zA-Z]*_[0-9]*_*.???" |
Find all *.dbf files/directories in entire file system discarding errors and print their sorted and unique parent directory paths | find / -name \*.dbf -print0 2>/dev/null | xargs -0 -n1 dirname | sort | uniq |
display a long listing of all the normal/regular files in the current folder | find . -type f -print0 | xargs -0 ls -l |
Find all files in the file system with the SUID bit | find / -perm -u+s -print |
Find all directories under current directory tree that match the case insensitive regex '^\./course\*[0-9]$' in their paths | find . -type d -iregex '^\./course\*[0-9]$' |
find the file "dateiname" in the entire file system ( case insensitive search) | find / -iname "Dateiname" |
Read a line from standard input into variable "foobar" and suppress showing user input | read -s foobar |
Print each character in "Hello" as a hexadecimal value | echo -n "Hello" | od -A n -t x1 |
Find all executable files under current directory and show a few lines of output from the beginning | find . -perm /a=x | head |
Write the lines appended to "xxxx" as it appears to the console and append to "yyyy" in the background | tail -F xxxx | tee -a yyyy & |
Find all files/directories containing 'farm' in their names under '/usr/share' directory tree | find /usr/share -name '*farm*' |
display all the files in the current folder except those whose name is "PERSONAL" | find . -name PERSONAL -prune -o -print |
display all the users in the current folder which do not belong to the user root | find . ! -user root |
Save the system host name in variable "HOSTNAME" | HOSTNAME="`hostname`" |
Save number of lines in '/some/big/file' to 'LINES' variable | LINES=$(cat /some/big/file | wc -l) |
Find all regular files in the current directory tree that are not readable by all | find -type f ! -perm -444 |
Find files in and below the current directory whose names begin with "not" and remove one of them | find . -name not\* | tail -1 | xargs rm |
Recursively finds all '*.pdf' files in a current folder and removes them. | find . -name "*.pdf" -print0 | xargs -0 rm |
Recursively finds in all folders but "./output/*" all files but *.o, *.swp and prints strings with 'soc_attach' text pattern and number of matched string. | find . \( ! -path "./output/*" \) -a \( -type f \) -a \( ! -name '*.o' \) -a \( ! -name '*.swp' \) | xargs grep -n soc_attach |
Prints message info about filename and location of the current script | echo "The script you are running has basename `basename $0`, dirname `dirname $0`" |
Replace all occurrences of 'previousword' with 'newword' in all regular files with '.cpp' extension under '/home/www' directory tree and modify them in-place | find /home/www -type f -name '*.cpp' -exec sed -i 's/previousword/newword/g' '{}' \; |
delete all the log files which have not been modified in the last 5 days after user confirmation | find . — name "*.LOG" — mtime +5 -ok rm {} \; |
Send SIGTERM signal to last process sent to background by the current shell. | kill $! |
Remove leading and trailing space from lines in file 'in.txt', interactively page through a hexdump of the result. | awk '{gsub; print;}' in.txt | hexdump -C | less |
display long listing of all files in the current directory whose size is 24 or 25 bytes. | find . -size -26c -size +23c -ls |
Set variable 'path' to name of current directory . | path=$(basename $) |
Search in current directory downwards all files whose owner is aa1 or whose name is myfile . | find . \ -print |
display all the files in the current folder which have been modified between two dates | find . -newermt “Sep 1 2006” -and \! -newermt “Sep 10 2006” |
Execute "ls -l" every 0.5 seconds | watch -n 0.5 ls -l |
find all the mp3 files in the file system | find / -iname "*.mp3" -print |
Find all files called "INPUT.txt" in the current directory tree and remove lines starting with # in them, saving backup copies as INPUT.txt.bak | find . -type f -name INPUT.txt -print0 | xargs -0 -I {} sed -i.bak '/^#/d' {} |
Find all directories under /home/me | find /home/me -type d |
Replace " " with " $UID " in the output of "history" | history | sed "s/ / $UID /" |
Count the toal number of lines in all .py files in current directory tree | find . -name *.py -exec wc -l {} \; | awk '{ SUM += $0} END { print SUM }' |
Search directory /home/ABCD recursively, starting from one level below, for regular files | find /home/ABCD/ -mindepth 1 -type f -print |
Find all files in the current directory tree with extension .html and replace all occurences of "php" with "html" inside them | find ./ -type f -name *".html" | xargs sed -i "s/php/html/g" |
Find all the regular files in $DIR directory tree which have not been modified in the last 450 days and delete them | find $DIR -type f -mtime +450 -exec rm {} \; |
Print 'infile' content with line numbers | cat -n infile |
Recursively finds file some_file_name.xml file and prints strings with "PUT_YOUR_STRING_HERE" preceding each found string with file name. | find . -type f -name some_file_name.xml -exec grep -H PUT_YOUR_STRING_HERE {} \; |
Delete all files/directories older than 48 hours in /path/to/files* paths | find /path/to/files* -mtime +2 -delete |
Mathematically sum each line in "infile" | paste -s -d+ infile | bc |
Delete all filename* files under /dir directory | find /dir -name "filename*" -type f -delete |
Find & calculate total number of caractor in all .txt file from current directory | find . -type f -name '*.txt' -exec wc -c {} \; | awk '{total += $1} END{print total}' |
display list of all the files in the current directory | find | xargs ls |
Interactively create a symbolic link in the current directory for "$SCRIPT_DIR/$FILE" | ln --symbolic --interactive $SCRIPT_DIR/$FILE |
Search the current directory tree for all files matching pattern "*.rb" | find . -name "*.rb" |
Copies file 'index.html' to each top-level directory in the current directory beginning with 'd'. | find . -mindepth 1 -maxdepth 1 -type d| grep \/a |xargs -n 1 cp -i index.html |
Print the full real path of "/dev/disk/by-uuid/$1" followed by "is mounted" | echo $ is mounted |
search for all the regular/normal mp3 files in the file system and move them to the folder /mnt/mp3 | find / -iname "*.mp3" -type f | xargs -I '{}' mv {} /mnt/mp3 |
Split the output of "tar [your params]" into files of at most 500 MiB in size and use prefix "output_prefix" | tar [your params] |split -b 500m - output_prefix |
Find recursively the latest modified file in the current directory | find . -type f | xargs ls -ltr | tail -n 1 |
Force create a symbolic link in "/usr/bin/" for each file matching "$javaUsrLib/jdk1*/bin/*" | sudo ln -f -s $javaUsrLib/jdk1*/bin/* /usr/bin/ |
Print the first 2 lines of tree's help message by redirecting it from standard error to standard output | tree --help 2>&1 | head -n2 |
Abort the shell or script on the first failed command | set -e |
change the current working directory to "B" and display all the files in that folder and append the output to the file "tmp.txt" | cd B && find . >> ../tmp.txt |
Find all .gif files in the /var/www directory tree | find /var/www -name *.gif |
Find all directories named "D" in the current directory tree | find ./ -type d -name 'D' |
Search the current directory tree for the files with extension "trc" and remove them if they are more than three days old | find . -name "*.trc" -ctime +3 -exec rm -f {} \; |
Decompress 'file.gz' to standard output and execute the output in bash | gzip -d --stdout file.gz | bash |
Find a directory named 'project.images' in the entire filesystem | find / -type d -name "project.images" |
Read a line from standard input into variable "SSHPASS" with prompt "Password: " and without echoing the input | read -p "Password: " -s SSHPASS |
Find all the files named 'vimrc' anywhere on the system | find / -name vimrc |
Locate OGG files under the home directory smaller than 100 megabytes | find $HOME -iname '*.ogg' -type f -size -100M |
Find all files under minimum 1 level down the current directory | find . -mindepth 1 -type f |
find all directories with the name root in the entire file system. | find / -type d -name root |
Find all .gz archives in the current directory tree and check if they are valid | find "*.gz" -exec gunzip -vt "{}" + |
Find all regular files on the system whose size is greater than 20000k | find / -type f -size +20000k |
Lists all files in a current folder, separating names with comma. | ls -1 | tr '\n' ',' | sed 's/,$/\n/' |
search for the file "abc" in the current folder or display all the directories | find . -name abc -or -type d |
Search the ~ and `Music' directory trees for .mp3 files | find ~ Music -name '*.mp3' |
Send 5 pings to broadcast address "10.10.0.255" and print the unique IPs who responded | ping -c 5 -b 10.11.255.255 | sed -n 's/.* \([0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\+\).*/\1/p' | sort | uniq |
Locate all the hard links of file `passwd' | find / -samefile passwd |
Find all build* directories under /var/www/html/ and print all but first 5 appending with the string 'rf ' | find /var/www/html/ -type d -name "build*" | sort | tail -n +5 | xargs -I % echo -rf % |
Find all the regular files under $DIR directory tree which have been modified before the file $a excluding the file $a and delete them | find "$DIR" -type f \! -newer "$a" \! -samefile "$a" -exec rm {} + |
Find all symbolic links under '/proc/$pid/fd' directory tree with name pattern '$save_path/sess_\*' and update their timestamps | find "/proc/$pid/fd" -ignore_readdir_race -lname "$save_path/sess_\*" -exec touch -c {} |
Creates temporary file with name formatted like '.script.XXXXXX' in '/tmp/' folder and saves path to it in 'script2' variable. | script2=`mktemp /tmp/.script.XXXXXX`; |
reverse both words and lines in file | tac filename | perl -lane 'print join(" ", reverse)' |
Search the ~/Books directory recursively for regular files named "Waldo" | find ~/Books -type f -name Waldo |
search for the file filename in the entire file system | find / -name filename |
Calculate the sum of all the numbers from -5 to 10 | seq -s+ -5 10 | bc |
Gets state of shell option 'dotglob' and saves it in 'rest_cmd' variable. | rest_cmd=$ |
Remove all files that end with 'prefs copy' in their names under '/mnt/zip' directory tree | find /mnt/zip -name "*prefs copy" -print | xargs rm |
Replace all spaces with underscores in file paths under current directory. | find -name "* *" -type f | rename 's/ /_/g' |
Find all file in current directory with have .c extenstion & have 777 permission . delete then | find . -name "*.c" -a -perm -777 | xargs rm -rf |
search for MP3 files in the current folder and subfolders except in dir1 subfolder. | find ! -path "dir1" -iname "*.mp3" |
show all the files in the folder /etc which have been modified in the last 24 hours | find /etc -mtime -1 |
Write the current date and time followed by " 0" to the console and append to "log.csv" | echo $(date) "0" | tee -a log.csv |
find all files that were modified between 90 to 100 days ago in home directory and delete then . | find /home -type f -mtime +90 -mtime -100 -exec rm {} \; |
Print the file sizes along with their paths for all *.txt (case insensitive) files/directories under current directory tree | find . -iname "*.txt" -exec du -b {} + |
List files in the current directory | find . \ |
Saves date of the first Sunday in month $mo of year $yo in the 'do' variable. | do=$(cal -m $mo $yo|awk 'NR>2&&!/^ /{print$1;exit}') |
Find all hard links to file1 under /home directory | find /home -xdev -samefile file1 |
Interactively page through a list of all processes running on the system - the arrow keys pan around, and the Q key quits. | ps aux | less -S |
Print all files and directories in the `.' directory tree skipping SCCS directories but printing out the SCCS directory name | find . -print -name SCCS -prune |
Search the *.pdf files from directory tree PDFs/ for text "perry sound", ignoring the case, and print the list of matched files | find PDFs/ -name '*.pdf' -exec sh -c 'pdftotext "{}" - | grep -l -i --with-filename --label="{}" --color "perry sound"' \; |
Archive preserving permissions and ownership files in "/var/www/" on host "[email protected]" to local "/var/www/" | sudo rsync -az [email protected]:/var/www/ /var/www/ |
Print all directories under $root appending a : at the end of each path | find $root -type d -printf '%p:' |
Find all thumb.png files in the temps/ directory tree | find temps/ -name "thumb.png" |
display list of all the files in the current directory | find -print0 | xargs -0 ls |
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