I saw that many people face the problem to loop through the file content in Bash.
I have some solutions for this. There are many ways through you can achieve this.
You can choose the one which suits you.
Option No.1
Option No. 2
Option No. 3
Open the file, read from a file descriptor (in this case file descriptor #4).
Option No. 4
I hope these options are helpful for you. 😃
Let me know your feedback!
Thanks for reading!
Amit
Tags: Read the content of file through bash, loop through content of file bash, bash read file
I have some solutions for this. There are many ways through you can achieve this.
You can choose the one which suits you.
Option No.1
while IFS="" read -r p || [ -n "$p" ]
do
printf '%s\n' "$p"
done < peptides.txt
If your file has leading whitespace, interpretting backslash sequences, and you want to skip the trailing line then above solution is for you.Option No. 2
#!/bin/bash
filename='peptides.txt'
echo Start
while read p; do
echo $p
done < $filename
above option is a while loop option. Single line at a time. Input redirection.Option No. 3
#!/bin/bash
filename='peptides.txt'
exec 4<$filename
echo Start
while read -u4 p ; do
echo $p
done
Above one is also in while loop: Single line at a time:Open the file, read from a file descriptor (in this case file descriptor #4).
Option No. 4
Above option is with simple while loop. You need to set the IFS properly, otherwise you will loose the indentation. Also always use the -r option with read. NEVER EVER use the for loop for reading lines.while IFS= read -r line; do echo "$line" done <file
I hope these options are helpful for you. 😃
Let me know your feedback!
Thanks for reading!
Amit
Tags: Read the content of file through bash, loop through content of file bash, bash read file
Back after very long time... Good to see you... Your posts were awesome and gave perfect solutions for issues... I really miss those.
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