uniq [ -c | -d | -u ] file -c, --count prefix lines by the number of occurrences -d, --repeated only print duplicate lines, one for each group -D print all duplicate lines -u, --unique only print unique lines -f, --skip-fields=N avoid comparing the first N fields 2.3 文本...
With no options, matching lines are merged to the first occurrence. Mandatory arguments tolongoptions are mandatoryforshortoptions too.-c, --count prefix lines by the number of occurrences-d, --repeated only print duplicate lines-D, --all-repeated[=delimit-method] print all duplicate lines del...
uniq -c: which adds the repetition count to each line; uniq -d: which only outputs duplicate lines; And uniq -u: which only outputs unique lines. However, uniq is not a smart command. Repeated lines will not be detected if they are not adjacent. Which means that you first need the ...
Combine sort and uniq using a pipe to remove duplicate lines sort random_order.txt | uniq Powered By Variables List all environment variables with set set Powered By Create a shell variable with name=value (no spaces around =) mydata=sales.csv Powered By Create a shell variable from...
Sometimes, you may require reading any text file by omitting duplicate lines of data. Bash uniq command is a useful command line utility tool that is used to read a text file by filtering or removing adjacent duplicate lines from the text file. uniq comm
1 Introduction 1.2 What is a shell? 2 Definitions 3 Basic Shell Features 6.9 Controlling the Prompt 6.10 The Restricted Shell 6.11 Bash POSIX Mode 7 Job Control 7.1 Job Control Basics 7.2 Job Control Builtins 7.3 Job Control Variables
When this variable is assigned a value, the his- tory file is truncated, if necessary, by removing the oldest entries, to contain no more than that number of lines. The default value is 500. The history file is GNU Bash-4.1 Last change: 2009 December 29 22 User Commands BASH(1) also...
Command substitution, commands grouped with parentheses, and asynchronous commands are invoked in a subshell environment that is a duplicate of the shell environment, except that traps caught by the shell are reset to the values that the shell inherited from its parent at invocation. Builtin ...
Read line by line from standard input Bash [duplicate], If you only provide a single variable to read , you will read the entire line into that variable (unless you have set a new delimiter with Looping Through Lines Within a Variable using Bash ...
uniq -c counts consecutive, duplicate lines, which is why we need the pre-sort. Then sort -rn gives us a reverse, numerical sort, with the most popular shell at the top. If you don’t need to count the occurrences and just want a unique list of values—i.e., if you want sort ...