What does "1>&2" mean?

Login or Register to Ask a Question and Join Our Community

What does "1>&2" mean?

Tags

amp, shell scripts

Login to Discuss or Reply to this Discussion in Our Community

Top Forums Shell Programming and Scripting What does "1>&2" mean?

12-02-2008

Registered User

13, 0

Join Date: Mar 2008

Last Activity: 28 May 2010, 3:06 PM EDT

Posts: 13

Thanks Given: 0

Thanked 0 Times in 0 Posts

What does "1>&2" mean?

Code:

if [ $# -ne 3 ]; then
            echo 1>&2 Usage: $0 19 Oct 91
            exit 127
fi

What does "1>&2" ? Please let me know

vinayrao

View Public Profile for vinayrao

Find all posts by vinayrao

12-02-2008

Registered User

11,728, 1,345

Join Date: Feb 2004

Last Activity: 8 May 2020, 9:07 AM EDT

Location: NM

Posts: 11,728

Thanks Given: 903

Thanked 1,345 Times in 1,201 Posts

1 - stdout
2 - stderr

This means redirect echo's output to stderr, with a message on how to use the script,
there needs to be exactly three arguments.

All error conditions should go to stderr.

jim mcnamara

View Public Profile for jim mcnamara

Find all posts by jim mcnamara

Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

find files in sub dir with tag & add "." at the beginning [tag -f "Note" . | xargs -0 {} mv {} .{}]

I am trying find files in sub dir with certain tags using tag command, and add the period to the beginning. I can't use chflags hidden {} cause it doesn't add period to the beginning of the string for web purpose. So far with my knowledge, I only know mdfind or tag can be used to search files with...

2. Shell Programming and Scripting

Bash script - Print an ascii file using specific font "Latin Modern Mono 12" "regular" "9"

Hello. System : opensuse leap 42.3 I have a bash script that build a text file. I would like the last command doing : print_cmd -o page-left=43 -o page-right=22 -o page-top=28 -o page-bottom=43 -o font=LatinModernMono12:regular:9 some_file.txt where : print_cmd ::= some printing...

3. Web Development

How would I mod_rewrite "/~a1Pha" and "/=a1Pha" to "/paste/a1Pha.htm"? (internally & externally)

Basically I want to shorten URLs on my html pasting site (pasteht.ml), by using "/~a1Pha" instead of "/paste/a1Pha". The ID is 5 numbers and letters, both cases. For example: /~idnum serves /paste/idnum.htm /=idnum serves /paste/idnum.htm /paste/idnum redirects to /~idnum (to update any old...

4. Shell Programming and Scripting

finding the strings beween 2 characters "/" & "/" in .txt file

Hi all. I have a .txt file that I need to sort it My file is like: 1- 88 chain0 MASTER (FF-TE) FFFF 1962510 /TCK T FD2TQHVTT1 /jtagc/jtag_instreg/updateinstr_reg_1 dff1 (TI,SO) 2- ...

5. Red Hat

files having Script which works behind "who" & "w" commands

Dear All, plz print the path of files which have the script of "who" & "w" commands. thnx in advance.

6. Shell Programming and Scripting

awk command to replace ";" with "|" and ""|" at diferent places in line of file

Hi, I have line in input file as below: 3G_CENTRAL;INDONESIA_(M)_TELKOMSEL;SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL My expected output for line in the file must be : "1-Radon1-cMOC_deg"|"LDIndex"|"3G_CENTRAL|INDONESIA_(M)_TELKOMSEL"|LAST|"SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL" Can someone...

7. Shell Programming and Scripting

"sed" to check file size & echo " " to destination file

Hi, I've modified the syslogd source to include a thread that will keep track of a timer(or a timer thread). My intention is to check the file size of /var/log/messages in every one minute & if the size is more than 128KB, do a echo " " > /var/log/messages, so that the file size will be set...

8. HP-UX

To give the "unzip" permissions & "create" file permissions

Hi, I am a Unix Admin. I have to give the permissions to a user for creating new file in a directory in HP-Ux 11.11 system since he cannot able to create a new file in the directory. Thanks in advance. Mike

9. UNIX for Dummies Questions & Answers

Run away "bootpgw" & "inetd"

Hello All. I'm get the following messages posted to the /var/adm/syslog file ever second and not sure on how to stop the process. May 14 15:50:52 a3360 bootpgw: version 2.3.5 May 14 15:50:52 a3360 inetd: /etc/bootpgw exit 0x1 As said about this gets logged every second only thing that...

10. UNIX for Dummies Questions & Answers

"nohup" and "&" commands

Why would anyone ever type in a command like this: nohup command & nohup lets you logout of your telnet session so why add "&" to run it in the background?

Login or Register to Ask a Question