Visit Our UNIX and Linux User Community


Sorting in a for loop


 
Thread Tools Search this Thread
Top Forums UNIX for Advanced & Expert Users Sorting in a for loop
# 1  
Old 09-10-2009
Sorting in a for loop

when i use a for loop like this,

for s in *
do
echo $s
done

it give me the result in this fashion;

1
10
12
2
23
3

I need it sorted in numerical order, like this;

1
2
3
10
12
23

Thanks in advance.
# 2  
Old 09-10-2009
Are your filenames just numbers like: 1, 2, 23?
Otherwise what do you think you are getting with the * ?

* makes filenames appear in alphabetic order, so I do not understand what the * is doing. Or if you are even using * the way you think you are.
# 3  
Old 09-10-2009
Code:
for s in *
do
echo $s
done | sort -n

# 4  
Old 09-10-2009
thanks daPeach but this dosen't work for me because i need to sort the files before start the loop.
I'm going to do more things than just echo them;

Code:
a=1
for s in *
do
echo "$s ""---"" $a"
a=$(($a+1))
done | sort -n

If i do what you tell me i get this;

Code:
1 --- 1
2 --- 4
3 --- 6
10 --- 2
12 --- 3
23 --- 5

i need...

Code:
1 --- 1
2 --- 2
3 --- 3
10 --- 4
12 --- 5
23 --- 6


Last edited by vgersh99; 09-10-2009 at 04:18 PM.. Reason: code tags, PLEASE!
# 5  
Old 09-10-2009
Code:
a=1
for s in $(echo *|sort -n); do
  echo "$s ""---"" $((a++))"
done

# 6  
Old 09-10-2009
Quote:
Originally Posted by Scrutinizer
Code:
a=1
for s in $(echo *|sort -n); do
  echo "$s ""---"" $((a++))"
done

The code resulted in alpha sorting, rather than numeric sorting, when I tried it.

This modification seems to produce results that are numerically sorted:

Code:
a=1
for s in $(echo * | sed 's/\W\+/\
/g ' |sort -n)
do
echo "$s ""---"" $a"
a=$(($a+1))
done

# 7  
Old 09-10-2009
Dang you're right. I did not really check the code.
Interestingly
Code:
a=1
for s in $(ls|sort -n); do
  echo "$s ""---"" $((a++))"
done

Does work as expected...

edit:

So sort works when newline is the separator, but in the case of ls, but does or doesn't ls produce a newline?
Code:
echo *
1 10 12 2 23 3
echo *>/tmp/test1
cat /tmp/test1
1 10 12 2 23 3

Code:
ls
1  10  12  2  23  3

ls>/tmp/test2
cat /tmp/test2
1
10
12
2
23
3


Last edited by Scrutinizer; 09-10-2009 at 08:11 PM..

Previous Thread | Next Thread
Test Your Knowledge in Computers #225
Difficulty: Easy
In September 2019, according to NetMarketShare, Google commanded over 90% market share for desktop search engines.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

For loop or while loop from a text file

Hi all, i developed a script to measure the uptime of a process in a Solaris 10/11 environments. All is well, but i came across a situation where there are multiple processes of the same name. Basically i have the following result file: beVWARS 13357 19592122 beVWARS 14329 19591910... (4 Replies)
Discussion started by: nms
4 Replies

2. Shell Programming and Scripting

Sorting out unique values from output of for loop.

Hi , i have a belwo script which is used to get sectors per track value extarcted from Solaris machine: for DISK in /dev/dsk/c*t*d*s*; do value=`prtvtoc "$DISK" | sed -n -e '/Dimensions/,/Flags/{/Dimensions/d; /Flags/d; p; }' | sed -n -e '/sectors\/track/p'`; if ; then echo... (4 Replies)
Discussion started by: omkar.jadhav
4 Replies

3. Shell Programming and Scripting

awk loop using array:wish to store array values from loop for use outside loop

Here's my code: awk -F '' 'NR==FNR { if (/time/ && $5>10) A=$2" "$3":"$4":"($5-01) else if (/time/ && $5<01) A=$2" "$3":"$4-01":"(59-$5) else if (/time/ && $5<=10) A=$2" "$3":"$4":0"($5-01) else if (/close/) { B=0 n1=n2; ... (2 Replies)
Discussion started by: klane
2 Replies

4. Shell Programming and Scripting

Reset while loop to loop same file multiple times

Hi, I want to read file multiple times. Right now i am using while loop but that is not working. ex. While read line do while read line2 do echo stmt1 #processing some data based on data., done < file2.txt done < file1.txt # This will have 10... (4 Replies)
Discussion started by: tmalik79
4 Replies

5. Shell Programming and Scripting

Array Variable being Assigned Values in Loop, But Gone when Loop Completes???

Hello All, Maybe I'm Missing something here but I have NOOO idea what the heck is going on with this....? I have a Variable that contains a PATTERN of what I'm considering "Illegal Characters". So what I'm doing is looping through a string containing some of these "Illegal Characters". Now... (5 Replies)
Discussion started by: mrm5102
5 Replies

6. Shell Programming and Scripting

S# in a for loop - concatenate $(loop counter)

Hi, hope I am posting in the right section. My problem is that I have 2 or more arguments passed and I want to check if the arguments passed exists or not. The first argument should not exist and the remaining others should exist. example: ./shells.sh argument1 argument2 argument3 ... (5 Replies)
Discussion started by: fight4love
5 Replies

7. Shell Programming and Scripting

BASH loop inside a loop question

Hi all Sorry for the basic question, but i am writing a shell script to get around a slightly flaky binary that ships with one of our servers. This particular utility randomly generates the correct information and could work first time or may work on the 12th or 100th attempt etc !.... (4 Replies)
Discussion started by: rethink
4 Replies

8. Shell Programming and Scripting

Null Handling in Until loop. . .loop won't stop

Hi Im running this script, which is supposed to find the max value build some tables and then stop running once all the tables are built. Thing is , it keeps assigning a null value to $h and then $g is null so it keep building tables i.e. testupdateNUL. How can I stop this? Here is what I have: ... (4 Replies)
Discussion started by: brandono66
4 Replies

9. Shell Programming and Scripting

Using variables created sequentially in a loop while still inside of the loop [bash]

I'm trying to understand if it's possible to create a set of variables that are numbered based on another variable (using eval) in a loop, and then call on it before the loop ends. As an example I've written a script called question (The fist command is to show what is the contents of the... (2 Replies)
Discussion started by: DeCoTwc
2 Replies

10. Shell Programming and Scripting

how to get the similar function in while loop or for loop

Dear all How to write the shell script for the following statement: (C programming) for (i=0;i<30;i++) { if i=1 continue *skip this number (To do function here....) ... } similar statement in while loop.... I wrote the script in sh... (3 Replies)
Discussion started by: trynew
3 Replies

Featured Tech Videos