🖥️tr

➡️This is a command-line reference manual for commands and command combinations that you don’t use often enough to remember it. This cheatsheet explains the tr command with important options and switches using examples.

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#replace : with new line
echo $PATH|tr ":" "\n" #equivalent with:
echo $PATH|tr -t ":" \n 

#remove all occurance of "ab"
echo aabbcc |tr -d "ab"
#ouput: cc

#complement "aa"
echo aabbccd |tr -c "aa" 1
#output: aa11111 without new line
#tip: Complement meaning keep aa,all others are replaced with 1

#complement "ab\n"
echo aabbccd |tr -c "ab\n" 1
#output: aabb111 with new line

#Preserve all alpha(-c). ":-[:digit:] etc" will be translated to "\n". sequeeze mode.
echo $PATH|tr -cs "[:alpha:]" "\n" 

#ordered list to unordered list
echo "1. /usr/bin\n2. /bin" |tr -cs " /[:alpha:]\n" "+"

tr -d '\r' < vmargs.txt | tr '\n' ' '
#  Join lines and separate with spaces Read vmargs.txt, which is a text file that could either be DOS-style (\r\n) or UNIX-style (\n) line endings and join the lines with a space separator. Can this be shortened/made more elegant?

tr [:upper:] [:lower:]
# The 'tr' command can be used to quickly convert uppercase to lowercase and vice versa. This is done with:

tr -cd , < file.txt | wc -m 
# Count the number of commas (,) in a text file.

# Format a list of emails so that when you paste them into Outlook (ugh!), it breaks them up into individual addrs
tr $'\n' \; < email-list

#  bash compress css - bash compress css: gistfile1.txt 
tr '[:space:][:cntrl:]' ' ' | tr -s ' ' | \
	sed -e 's| \?: \?|:|g' \
		-e 's| \?{ \?|{|g' \
		-e 's| \?} \?|}|g' \
		-e 's| \?; \?|;|g' \
		-e 's| \?, \?|,|g' \
		-e 's| \?!|!|g' \
		-e 's|;}|}|g'

# tr Command
#-------------------------------------------------///
# This tool translates or deletes characters from standard input and writes results to standard output. The syntax for using tr is as follows:

tr options set1 set2

# Take a look at the examples below, in the first command, set1( [:upper:] ) represents the case of input characters (all upper case). Then set2([:lower:]) represents the case in which the resultant characters will be. It’s same thing in the second example and the escape sequence \n means print output on a new line:

echo "WWW.TECMINT.COM" | tr [:upper:] [:lower:]
www.tecmint.com

echo "news.tecmint.com" | tr [:lower:] [:upper:]
NEWS.TECMINT.COM

# Show the PATH, one directory per line (part 2)   -   Here is another way to show the path, one directory per line. The command `tr` translates the colon into the new line, taking input from the $PATH variable Show Sample Output
tr : \\n <<<$PATH

## Verschlüsselung mit tr ##
#--------------------------#
tr 'e' 'X' < ameisen.txt
# in hamburg lXbtXn zwXi amXisXn,

tr 'a-z' 'A-Z'
# IN HAMBURG LEBTEN ZWEI AMEISEN,

tr 'a-z' 'n-za-m' < ameisen
# va unzohet yrogra mjrv nzrvfra,

# In Datei Abspeichern
tr 'a-z' 'n-za-m' < ameisen > ameisen_kodiert

# Remove Line Breaks with tr
# I had a text file with multiple lines of input that I was manipulating using awk and sed but I found the following 'tr' command easiest to remove the line breaks:
cat input.txt | tr -d '\n'

#==============================##==============================#
# CMD TR						       #
#==============================##==============================#

Cheatsheets are an excellent complement to other information sources like Linux man-pages, Linux help, or How-To’s and tutorials, as they provide compact and easily accessible information. While man-pages and detailed tutorials often contain comprehensive explanations and extensive guides, cheatsheets summarize the most important options forthe command tr in a clear format. This allows users to quickly access the needed information for tr without having to sift through lengthy texts. Especially in stressful situations or for recurring tasks, cheatsheets for tr are a valuable resource to work efficiently and purposefully.

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