# Print "hello world".
# Hint: There are many ways to print text on
# the command line, one way is with the 'echo'
# command.
#
# Try it below and good luck!
#
bash(0)> echo "hello world"
===============================================================================================
# Print the current working directory.
#
bash(0)> pwd
/var/challenges/current_working_directory
# 👍 👍 👍  Correct!
===============================================================================================
# List names of all the files in the current
# directory, one file per line.
#
bash(0)> ls -l
total 8
-rw-r--r--. 1 501 dialout 107 Feb  9 23:35 README
bash(0)> ls
README
# 👍 👍 👍  Correct!
===============================================================================================
# Print all files in the current directory,
# one per line (not the path, just the filename)
# that contain the string "500".
#
bash(0)> grep -lir "500" *
README
access.log
access.log.1
# 👍 👍 👍  Correct!
===============================================================================================
# Print the last 5 lines of "access.log".
#
bash(0)> tail -n 5 access.log
199.37.62.156 - - [09/Jan/2017:22:42:18 +0100] "GET /posts/1/display HTTP/1.0" 200 2477
55.74.240.123 - - [09/Jan/2017:22:44:25 +0100] "POST /posts/1/display HTTP/1.0" 200 3471
251.111.109.143 - - [09/Jan/2017:22:49:02 +0100] "GET /posts/foo?appID=xxxx HTTP/1.0" 200 2477
101.163.230.250 - - [09/Jan/2017:22:52:31 +0100] "DELETE /posts/2/display HTTP/1.0" 404 2477
200.19.168.148 - - [09/Jan/2017:22:57:11 +0100] "GET /posts/foo?appID=xxxx HTTP/1.0" 200 3471
# 👍 👍 👍  Correct!
===============================================================================================
# There is a file named "access.log" in the
# current directory. Print the contents.
#
bash(0)> cat access.log
163.56.115.58 - - [09/Jan/2017:22:29:57 +0100] "GET /posts/2/display HTTP/1.0" 200 3240
75.113.188.234 - - [09/Jan/2017:22:30:43 +0100] "GET /posts/foo?appID=xxxx HTTP/1.0" 200 1116
69.16.40.148 - - [09/Jan/2017:22:34:33 +0100] "GET /pages/create HTTP/1.0" 500 3471
225.219.54.140 - - [09/Jan/2017:22:35:30 +0100] "GET /posts/foo?appID=xxxx HTTP/1.0" 500 2477
207.243.19.2 - - [09/Jan/2017:22:38:03 +0100] "GET /bar/create HTTP/1.0" 200 1116
199.37.62.156 - - [09/Jan/2017:22:42:18 +0100] "GET /posts/1/display HTTP/1.0" 200 2477
55.74.240.123 - - [09/Jan/2017:22:44:25 +0100] "POST /posts/1/display HTTP/1.0" 200 3471
251.111.109.143 - - [09/Jan/2017:22:49:02 +0100] "GET /posts/foo?appID=xxxx HTTP/1.0" 200 2477
101.163.230.250 - - [09/Jan/2017:22:52:31 +0100] "DELETE /posts/2/display HTTP/1.0" 404 2477
200.19.168.148 - - [09/Jan/2017:22:57:11 +0100] "GET /posts/foo?appID=xxxx HTTP/1.0" 200 3471
# 👍 👍 👍  Correct!
===============================================================================================
# Print the relative file paths, one path
# per line for all filenames that start with
# "access.log" in the current directory.
#
bash(0)> ls a*
access.log
access.log.1
access.log.2
# 👍 👍 👍  Correct!
===============================================================================================
# Delete all of the files in this challenge
# directory including all subdirectories and
# their contents.
#
bash(0)> ls -A1 | xargs rm -rf
# 👍 👍 👍  Correct!
===============================================================================================
# Count the number of files in the current
# working directory. Print the number of
# files as a single integer.
#
bash(0)> ls -la
total 32
drwxr-xr-x.  2 501 dialout 4096 Jan 29 20:50 .
drwxr-xr-x. 34 501 dialout 4096 Feb  9 23:33 ..
-rw-r--r--.  1 501 dialout  145 Feb  9 23:35 README
-rw-r--r--. 11 501 dialout  901 Jan  9 21:28 access.log
bash(0)> ls | wc -l
2
===============================================================================================
# Print the contents of access.log
# sorted.
#
bash(0)> sort -1
sort: invalid option -- '1'
Try 'sort --help' for more information.
bash(2)> sort access.log
101.163.230.250 - - [09/Jan/2017:22:52:31 +0100] "DELETE /posts/2/display HTTP/1.0" 404 2477
163.56.115.58 - - [09/Jan/2017:22:29:57 +0100] "GET /posts/2/display HTTP/1.0" 200 3240
199.37.62.156 - - [09/Jan/2017:22:42:18 +0100] "GET /posts/1/display HTTP/1.0" 200 2477
200.19.168.148 - - [09/Jan/2017:22:57:11 +0100] "GET /posts/foo?appID=xxxx HTTP/1.0" 200 3471
207.243.19.2 - - [09/Jan/2017:22:38:03 +0100] "GET /bar/create HTTP/1.0" 200 1116
225.219.54.140 - - [09/Jan/2017:22:35:30 +0100] "GET /posts/foo?appID=xxxx HTTP/1.0" 500 2477
251.111.109.143 - - [09/Jan/2017:22:49:02 +0100] "GET /posts/foo?appID=xxxx HTTP/1.0" 200 2477
55.74.240.123 - - [09/Jan/2017:22:44:25 +0100] "POST /posts/1/display HTTP/1.0" 200 3471
69.16.40.148 - - [09/Jan/2017:22:34:33 +0100] "GET /pages/create HTTP/1.0" 500 3471
75.113.188.234 - - [09/Jan/2017:22:30:43 +0100] "GET /posts/foo?appID=xxxx HTTP/1.0" 200 1116
# 👍 👍 👍  Correct!
===============================================================================================
# Print the number of lines
# in access.log that contain the string
# "GET".
#
bash(0)> grep access.log | wc -l
0
bash(0)> grep "GET" access.log | wc -l
8
# 👍 👍 👍  Correct!
===============================================================================================
# The file split-me.txt contains a list of
# numbers separated by a ';' character.
# Split the numbers on the ';' character,
# one number per line.
#
bash(0)> awk -F";" '{for(i=1;i<=$NF;i++) print $i}' split-me.txt
1
2
3
4
5
6
7
8
9
10
# 👍 👍 👍  Correct!
===============================================================================================
# Print the numbers 1 to 100 separated
# by spaces.
#
bash(2)> a=1; for i in {2..100}; do a+=" "$i; done; echo $a
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 5
7 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
# 👍 👍 👍  Correct!
===============================================================================================
# The file sum-me.txt has a list of numbers,
# one per line. Print the sum of these numbers.
#
bash(0)> cat sum-me.txt
1
2
3
5
7
11
13
bash(0)> acc=0; for i in $(cat sum-me.txt); do acc=$(( $acc+$i )); done; echo $acc
42
# 👍 👍 👍  Correct!
===============================================================================================
# You have a new challenge!
# Print the lines of the README file in this directory in
# reverse line order so that the last line is printed first
# and the first line is printed last.
# ~~~~~~~~~~~~~~~~~~~~~
# In the future
# Environmental destruction will be the norm
# No longer can it be said that
# My peers and I care about this earth
# It will be evident that
# My generation is apathetic and lethargic
# It is foolish to presume that
# There is hope
# ~~~~~~~~~~~~~~~~~~~~~
# -Jonathan Reed "The Lost Generation"
#
bash(0)> tac README
#
# -Jonathan Reed "The Lost Generation"
# ~~~~~~~~~~~~~~~~~~~~~
# There is hope
# It is foolish to presume that
# My generation is apathetic and lethargic
# It will be evident that
# My peers and I care about this earth
# No longer can it be said that
# Environmental destruction will be the norm
# In the future
# ~~~~~~~~~~~~~~~~~~~~~
# and the first line is printed last.
# reverse line order so that the last line is printed first
# Print the lines of the README file in this directory in
# **************
# Reverse the README
# 👍 👍 👍  Correct!
# You have a new challenge!
# Print the file faces.txt, but only print the first instance of each
# duplicate line, even if the duplicates don't appear next to each other.
# Note that order matters so don't sort the lines before removing duplicates.
#
# 👍 👍 👍  Correct!
===============================================================================================
# Print the 25th line of the file faces.txt
#
bash(0)> sed -n '25~25 p' faces.txt
¯\_(ツ)_/¯
# 👍 👍 👍  Correct!
===============================================================================================
# There are a mix of files in this directory
# that start with letters and numbers. Print
# the filenames (just the filenames) of all
# files that start with a number recursively
# in the current directory.
#
===============================================================================================
# The files in this challenge contain spaces.
# List all of the files (filenames only) in the
# current directory but replace all spaces with
# a '.' character.
#
bash(0)> ls | sed 's/\s/./g'
Adam.Simpson
Alexis.Stein
Allison.Brown
Amy.Anderson
Angel.Saunders
Brad.Michael
Briana.Wilson
Carrie.Alexander
Christine.Valdez
Christopher.Miller
Claudia.Mccormick
Corey.Bird
Courtney.Miller
Crystal.Dunn
Crystal.Valdez
Erica.Richardson
James.Harper
James.Roberts
Jared.Hill.DVM
John.Nguyen
Jorge.Ross
Joseph.Hurst
Karen.Ramirez
Kevin.Price
Kimberly.Parker
Lori.Macias
Luke.Mason
Lynn.Robinson
Mallory.Peterson
Marie.Gutierrez
Matthew.Romero
Michaela.Hobbs
Molly.Stevens
Mr..James.Lopez
Mr..Shawn.Martin
Mrs..Jade.Clark
Olivia.Irwin
Parker.Gilbert
README
Robert.Gregory
Robert.Hill
Sarah.Hill
Scott.Rice
Sheri.Bishop
Tamara.Anderson
Tammy.Galloway
Terri.Young
Thomas.Parks
Thomas.Washington
Tiffany.Clark
Yvonne.Myers
# 👍 👍 👍  Correct!
===============================================================================================
# Extract all IP addreses from files
# that start with "access.log" printing one
# IP address per line.
#
bash(0)> find . -name access.* -exec awk '{print $1}' {} \;
163.56.115.58
75.113.188.234
69.16.40.148
225.219.54.140
207.243.19.2
199.37.62.156
55.74.240.123
251.111.109.143
101.163.230.250
200.19.168.148
108.68.174.15
17.2.20.139
28.151.137.59
199.150.241.179
2.71.250.27
17.137.186.194
151.84.119.34
4.180.204.195
9.230.96.54
157.143.233.21
# 👍 👍 👍  Correct!
===============================================================================================
# Print all matching lines (without the filename
# or the file path) in all files under the current
# directory that start with "access.log" that
# contain the string "500". Note that there are no
# files named "access.log" in the current directory,
# you will need to search recursively.
#
bash(0)> find . -name access.* -exec grep "500" {} \;
69.16.40.148 - - [09/Jan/2017:22:34:33 +0100] "GET /pages/create HTTP/1.0" 500 3471
225.219.54.140 - - [09/Jan/2017:22:35:30 +0100] "GET /posts/foo?appID=xxxx HTTP/1.0" 500 2477
2.71.250.27 - - [09/Jan/2017:22:41:26 +0100] "GET /pages/create HTTP/1.0" 500 2477
# 👍 👍 👍  Correct!
===============================================================================================
# There are files in this challenge with
# different file extensions.
# Remove all files with the .doc extension
# recursively in the current working directory.
#
bash(0)> find . -name "*.doc" -exec rm {} \;
===============================================================================================
# This challenge has text files (with a .txt extension)
# that contain the phrase "challenges are difficult".
# Delete this phrase recursively from all text files.
# Note that some files are in subdirectories so you will
# need to search for them.
#
bash(0)> find . -name "*.txt" -exec sed -i '/challenges are difficult/ d' {} \;
# 👍 👍 👍  Correct!
===============================================================================================
# There are a mix of files in this directory
# that start with letters and numbers. Print
# the filenames (just the filenames) of all
# files that start with a number recursively
# in the current directory.
#
bash(0)> ls -pR | grep -e "^[0-9]" | grep -ve "/$"
04Carrie Alexander
132Rebecca Rubio
25Brandon Mcdonald
293Linda Bennett
335John Joseph
388Andrew Carter
402Nancy Henson
42Robert Hill
436Teresa Owens
477Thomas Pierce MD
48Thomas Allen
511Tammy Welch
540Katherine Jones
593Brett Martin
639Charles Ferguson
670James Jacobs
682Terri Jones
737Jeffrey Davis
757Robert Marquez
778Holly Archer
78Michelle Spencer
974Michael Bowman
3maxime.mp3
99blanditiis.avi
# 👍 👍 👍  Correct!
===============================================================================================
# Print all files in the current directory
# recursively without the leading directory path.
#
bash(0)> find -type f -printf %f'\n'
error.doc
corporis.xls
odit.doc
animi.doc
necessitatibus.doc
totam
beatae.flac
README
libero.xls
# 👍 👍 👍  Correct!
===============================================================================================
# Rename all files removing the extension from
# them in the current directory recursively.
#


===============================================================================================
# Print the file faces.txt, but only print the first instance of each
# duplicate line, even if the duplicates don't appear next to each other.
# Note that order matters so don't sort the lines before removing duplicates.
#
bash(2)> awk '!a[$0]++' faces.txt
(◕‿◕)
(^̮^)
ʘ‿ʘ
ಠ_ಠ
ಠ⌣ಠ
ಠ‿ಠ
(ʘ‿ʘ)
(ಠ_ಠ)
¯\_(ツ)_/¯
(ಠ⌣ಠ
ಠಠ⌣ಠ)
(ಠ‿ಠ)
٩◔̯◔۶
ヽ༼ຈل͜ຈ༽ﾉ
♥‿♥
◔̯◔
⊙﹏⊙
(¬_¬)
(；一_一)
(͡° ͜ʖ ͡°)
(° ͜ʖ °)
¯\(°_o)/¯
( ﾟヮﾟ)
(︺︹︺)
# 👍 👍 👍  Correct!
===============================================================================================
# The following excerpt from War and Peace is saved to
# the file 'war_and_peace.txt':
#
# She is betraying us! Russia alone must save Europe.
# Our gracious sovereign recognizes his high vocation
# and will be true to it. That is the one thing I have
# faith in! Our good and wonderful sovereign has to
# perform the noblest role on earth, and he is so virtuous
# and noble that God will not forsake him. He will fulfill
# his vocation and crush the hydra of revolution, which
# has become more terrible than ever in the person of this
# murderer and villain!
#
# The file however has been corrupted, there are random '!'
# marks inserted throughout.  Print the original text.
bash(0)> sed 's/!//g ;s/betraying us/betraying us!/; s/faith in/faith in!/; s/and villain/and villain!/;' war_and_peace.txt