Sponsored Content
Top Forums Shell Programming and Scripting Precedence in operators issue Post 302504464 by arvindspr06 on Monday 14th of March 2011 04:42:43 PM
Old 03-14-2011
Data Precedence in operators issue

Hello,
I am trying to write a small acript to change directory to $HOME depending on the user logged in. However when i provide this command
say,

ABC_USER=myself
cd ~${ABC_USER} i am getting the following error,

ksh: ~myself: not found

I know i am doing something really silly but not able to figure out what it is. I know i could get the value of the home directory by doing a grep on /etc/passed file but i think it is not a good solution.

Can anyone help or have encountered this issue before? I am thinking this issue is one of precedence where "~" is evaluated before the "$".

Anyone??
 

9 More Discussions You Might Find Interesting

1. Programming

EOF & precedence of !=

Gurus, I am teaching myself C and have a question. I wrote a small prog that reads characters as entered at the prompt and checks the value for EOF. Unless I am 100% wrong, the value will be '1' until getchar() has anything to read in my stream. /* PROG 1 */ #include <stdio.h> ... (4 Replies)
Discussion started by: alan
4 Replies

2. Shell Programming and Scripting

precedence of stderr and stdout

#!/usr/bin/perl open(STDOUT, ">>$Textfile") open(STDERR, ">>$Textfile") print "program running\n"; $final = join("+", $initial,$final) #5 close (STDOUT); close (STDERR);Hi all, above is my perl code. Notice i have captured the stdout and stderr to the same textfile. my code is expected to... (1 Reply)
Discussion started by: new2ss
1 Replies

3. Shell Programming and Scripting

setting precedence with getopts

Hi, I am re-writing a script I wrote which emulated the "rm" command, in my orginal script I had problems with precedence, I did find a way round it by creating a seperate case statements which checked the options and performed the actions accordingly, does anyone know if I can use getopts... (1 Reply)
Discussion started by: jack1981
1 Replies

4. UNIX for Dummies Questions & Answers

Operators

I am trying to understand Does the following: {tmp+=$10} Mean take $10 and add them all up and call it tmp thanks! (2 Replies)
Discussion started by: llsmr777
2 Replies

5. Programming

Makefile -> pc precedence over c

Hi All, I have created a common makefile that compiles both pc and c files. i have created the dependency between the files as .pc.o: ----------- .c.o: ----------- I will be deleting the .c files created from the .pc files, once the object file is created. ( better storage... (7 Replies)
Discussion started by: quintet
7 Replies

6. Shell Programming and Scripting

Operators

I really don't know the meaning of these operators. Could someone explain the meanings so I can make my test for today? <, <=, ==, !=, >=, >, ||, &&, ! ~ , !~ Thanks! (1 Reply)
Discussion started by: Erjen
1 Replies

7. Homework & Coursework Questions

Operators

I really don't know the meaning of these operators. Could someone explain the meanings? <, <=, ==, !=, >=, >, ||, &&, ! ~ , !~ Thanks! (1 Reply)
Discussion started by: Erjen
1 Replies

8. UNIX for Dummies Questions & Answers

issue with multiple logical operators

Hi, shell is /bin/ksh I am trying to do the following in my code.. but its showing me an error if ] && ] ]]; then echo "id is $ida and chk_dy is $chk_dy" fi the error I get is syntax error at line 23 : `"$ida"' unexpected I need to execute the... (2 Replies)
Discussion started by: nss280
2 Replies

9. UNIX for Dummies Questions & Answers

What should be precedence of using awk, sed, head and tail in UNIX?

Hi All, I am new to unix. In this forum some days back, I have read something like below: 1) Do not use perl if awk can do your work. 2) Do not use awk if sed can do your work. . . . I do not re-collect the whole thing. I think it is good to know the precedence of using these... (2 Replies)
Discussion started by: Prathmesh
2 Replies
cachefslog(1M)						  System Administration Commands					    cachefslog(1M)

NAME
cachefslog - Cache File System logging SYNOPSIS
cachefslog [-f logfile | -h] cachefs_mount_point DESCRIPTION
The cachefslog command displays where CacheFS statistics are being logged. Optionally, it sets where CacheFS statistics are being logged, or it halts logging for a cache specified by cachefs_mount_point. The cachefs_mount_point argument is a mount point of a cache file system. All file systems cached under the same cache as cachefs_mount_point will be logged. OPTIONS
The following options are supported. You must be super-user to use the -f and -h options. -f logfile Specify the log file to be used. -h Halt logging. OPERANDS
cachefs_mount_point A mount point of a cache file system. USAGE
See largefile(5) for the description of the behavior of cachefslog when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes). EXAMPLES
Example 1: Checking the Logging of a directory. The example below checks if the directory /home/sam is being logged: example% cachefslog /home/sam not logged: /home/sam Example 2: Changing the logfile. The example below changes the logfile of /home/sam to /var/tmp/samlog: example# cachefslog -f /var/tmp/samlog /home/sam /var/tmp/samlog: /home/sam Example 3: Verifying the change of a logfile. The example below verifies the change of the previous example: example% cachefslog /home/sam /var/tmp/samlog: /home/sam Example 4: Halting the logging of a directory. The example below halts logging for the /home/sam directory: example# cachefslog -h /home/sam not logged: /home/sam EXIT STATUS
The following exit values are returned: 0 success non-zero an error has occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
cachefsstat(1M), cachefswssize(1M), cfsadmin(1M), attributes(5), largefile(5) DIAGNOSTICS
Invalid path It is illegal to specify a path within a cache file system. SunOS 5.10 7 Feb 1997 cachefslog(1M)
All times are GMT -4. The time now is 03:34 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy