Bash for loop

stackoverflow.com › questions › 49110 › how-do-i-write-a-for-loop-in-bash

From this site:

for i in $(seq 1 10);
do
    echo $i
done

Answer from Rob Rolnick on Stack Overflow

Stack Overflow

stackoverflow.com › questions › 49110 › how-do-i-write-a-for-loop-in-bash

How do I write a 'for' loop in Bash? - Stack Overflow

Videos

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For Loop in Bash - YouTube

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Bash For Loop Examples | Shell Scripting Tutorial for Beginners

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Basic Bash For Loops Example

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W3Schools

w3schools.com › bash › bash_loops.php

Bash Loops

For loops allow you to iterate over a list of items or a range of numbers.

nixCraft

cyberciti.biz › nixcraft › howto › bash shell › how to write bash shell loop over set of files

How To Write Bash Shell Loop Over Set of Files - nixCraft

March 19, 2024 - You can loop through all files such as *.c, enter: $ for f in ./*.c; do echo "Processing $f file..."; done ... #!/bin/bash # NOTE : Quote it else use array to avoid problems # FILES="/path/to/*" for f in $FILES do echo "Processing $f file..."

GeeksforGeeks

geeksforgeeks.org › linux-unix › bash-scripting-for-loop

Bash Scripting - For Loop - GeeksforGeeks

September 15, 2023 - As said earlier, we need to use the variables inside the for loops to iterate over a range of elements. And thus, the C-styled for loops play a very important role. Let's see how we use them. #!/bin/bash n=7 for (( i=1 ; i<=$n ; i++ )); do echo $i done

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Linuxize

linuxize.com › home › bash › bash for loop: syntax and examples

Bash For Loop: Syntax and Examples | Linuxize

March 2, 2026 - How do I loop over command-line arguments? Use for arg in "$@"; do to iterate over all positional parameters passed to the script. The Bash for loop iterates over a list of items or runs for a defined number of iterations using C-style syntax.

Red Hat

redhat.com › en › blog › bash-scripting-loops

Introduction to Linux Bash programming: 5 `for` loop tips

March 1, 2021 - If you're not, I'll try to break it down in plain English for you. The basic concept is: FOR a given set of items, DO a thing. The given set of items can be a literal set of objects or anything that Bash can extrapolate to a list.

Saigontechsolutions

saigontechsolutions.com › bash-for-loop

Bash Scripting - For Loop - GeeksforGeeks

April 19, 2023 - We can use range-based for loops. In this type of loop, we can specify the number to start, stop, and increment in each iteration (optional) in the instruction. There are two ways to do this, i.e. mentioning the increment/decrementer value and incrementing by one by default. The syntax looks like this: #!/bin/usr/env bash for n in {1..5}; do echo $n done

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UCSB Library

carpentry.library.ucsb.edu › 2021-01-21-SWC-Bash-online › 05-loop

Loops – Intro to Bash Shell

January 21, 2021 - Typing in commands over and over ... the whole loop on one line (using semi-colons to separate the pieces): $ for datafile in NENE*[AB].txt; do echo $datafile stats-$datafile; done · Using the left arrow key, Nelle backs up and changes the command echo to bash goost...

MakeUseOf

makeuseof.com › home › programming › everything you need to know about bash for loops in linux

Everything You Need to Know About Bash For Loops in Linux

December 2, 2020 - With nothing to iterate through, a for loop operates on whatever command-line arguments were provided to the script when invoked. For example, if you have a script named args.sh containing the following: ... Bash recognizes this case and treats for a do as the equivalent of for a in $@ do where $@ is a special variable representing command-line arguments.

reddit.com › r/bash › how do i write a standard for loop in bash?

r/bash on Reddit: How Do I Write A Standard For Loop In Bash?

October 31, 2021 -

I'm extremely comfortable with the standard format of a for loop

for(x=0; x<10; x++){

actions

}

But apparently this syntax is not allowed in Bash? Why!?!??

What's the closest possible format I can use in Bash that resembles the format above? I thought that was the standard format for all programming languages.

I've searched everywhere online and can't find anything about this.

Top answer

1 of 16

3061

One way to do it is:

while read p; do
  echo "$p"
done <peptides.txt

As pointed out in the comments, this has the side effects of trimming leading whitespace, interpreting backslash sequences, and skipping the last line if it's missing a terminating linefeed. If these are concerns, you can do:

while IFS="" read -r p || [ -n "$p" ]
do
  printf '%s\n' "$p"
done < peptides.txt

Exceptionally, if the loop body may read from standard input, you can open the file using a different file descriptor:

while read -u 10 p; do
  ...
done 10<peptides.txt

Here, 10 is just an arbitrary number (different from 0, 1, 2).

2 of 16

830

cat peptides.txt | while read line 
do
   # do something with $line here
done

and the one-liner variant:

cat peptides.txt | while read line; do something_with_$line_here; done

These options will skip the last line of the file if there is no trailing line feed.

You can avoid this by the following:

cat peptides.txt | while read line || [[ -n $line ]];
do
   # do something with $line here
done

Guvi

ftp.guvi.in › hub › linux-guide-tutorial › bash-for-loop

Introduction to Bash For Loop

Bash for loop is used to repeat commands by iterating over strings, ranges, arrays, or conditions, with support for break and continue.

TecMint

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How to Use Bash For Loop in Linux: A Beginner's Tutorial

June 6, 2023 - You can also easily iterate through values defined in an array using a for Loop. In the following example, the for loop iterates through all the values inside the fruits array and prints them to stdout. #!/bin/bash fruits=("blueberry" "peach" "mango" "pineapple" "papaya") for n in ${fruits[@]}; do echo $n done

Great Learning

mygreatlearning.com › bash › tutorials › bash-for-loop

Bash For Loop - Great Learning

Some of the 'for loop' examples are given below for instance how do they work: ... In the Following we will print each word of a string / sentence in a single line. #!/bin/bash #This is the basic example of 'for loop'. learn="Start learning from Great Learning Academy and Achieve Your goals." for learn in $learn do echo $learn done echo "Thank You."

Compciv

compciv.org › topics › bash › loops

For and Read-While Loops in Bash

It's hard to tell, but a "loop" did execute. It just executed once. OK, so how do we make it execute more than one time? Add more (space-separated) elements to the right of the in keyword. Let's add four more 1's: user@host:~$ for x in 1 1 1 1 > do > echo Hi > done Hi Hi Hi Hi