10-16-2012
Dont think bash has a "likes" operator "=~" which exists in perl so the basis of the if test is wrong...
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi All,
I would like to have a script which is able to perform the below.
Print the whole row if column1 which is "0001" for the below example is the first occurrence. Subsequent "0001" occurrence will not be printed out and so on.
Can any expert help ?
Input:
0001 k= 40
0001 k= 2... (7 Replies)
Discussion started by: Raynon
7 Replies
2. Shell Programming and Scripting
I am trying to create a shell that asks the user to enter their name, and compare it to my own by saying we have the same name or saying my name and that they have a nice name too. Here is my script...
#!/bin/bash-x
echo "Enter your name".
read name
if
then
echo "My name is Adam too"... (1 Reply)
Discussion started by: amaxey45
1 Replies
3. Shell Programming and Scripting
abc.dat
tty cpu
tin tout us sy wt id
0 0 7 3 19 71
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 133.2 0.0 682.9 0.0 1.0 0.0 7.2 0 79 c1t0d0
0.2 180.4 0.1 5471.2 3.0 2.8 16.4 15.6 15 52 aaaaaa1-xx
I want to skip first 5 line... (4 Replies)
Discussion started by: kchinnam
4 Replies
4. UNIX for Dummies Questions & Answers
Hi there,
how can i print the first pattern occurrence in a .log file?
I want to print the filename of the first 17262?
I tried but all I can do is print all the lines with the number 17262?
I tried using awk and sed but nothing!:wall:
I just want filename!
Here´s an example:
17259... (3 Replies)
Discussion started by: BMatter
3 Replies
5. Shell Programming and Scripting
Hi,
I have a file, which contains the following log data.
I am trying to print fromt he file the following data:
I have tried using sed, but I am getting from the first pattern
Thanks for your help. (5 Replies)
Discussion started by: sol_nov
5 Replies
6. Shell Programming and Scripting
I have a file
# cat asasas
AAAAAA
11
22
33
44
BBBBB
NILNILNIL
AAAAAA
22
33
44
55
66
77
88
BBBBB
NILNILNIL (2 Replies)
Discussion started by: anil510
2 Replies
7. Shell Programming and Scripting
Hello to all,
How would be the correct regex to match only the first occurence of
the pattern 3.*6.
I'm trying with 3.*6 trying to match only 34rrte56, but with my current regex is matching 4rrte567890123456789123powiluur56. And if I try with ?
doesn't print anything
echo... (6 Replies)
Discussion started by: Ophiuchus
6 Replies
8. Shell Programming and Scripting
Hi,
Do anybody know how to use awk to count the pattern at specific column?
Input file
M2A928K 419 ath-miR159a,gma-miR159a-3p,ptc-miR159a 60 miR235a
.
.
Output file
M2A928K 419 ath-miR159a,gma-miR159a-3p,ptc-miR159a 60 miR235a 3
.
.
I plan to count how many "miR" in column 3... (2 Replies)
Discussion started by: cpp_beginner
2 Replies
9. Shell Programming and Scripting
Hello.
In bash, is there a way to trap error "file not found" when a script call another script which is not found; then abort.
Example ( part of script running with -x option set) :
+ return 0
+ RETURN_CODE=0
+ ]
+ /root/bin/200_yast_install/00_reset_yast_install
bash:... (5 Replies)
Discussion started by: jcdole
5 Replies
10. Shell Programming and Scripting
Hi folks,
I have a file with lots of lines in a text file,i need to print the occurence number after sorting based on the first column as shown below, thanks in advance.
sam,dallas,20174
sam,houston,20175
sam,atlanta,20176
jack,raleigh,457865
jack,dc,7845
john,sacramento,4567
... (4 Replies)
Discussion started by: tech_frk
4 Replies
LEARN ABOUT DEBIAN
plan9-test
TEST(1) General Commands Manual TEST(1)
NAME
test - set status according to condition
SYNOPSIS
test expr
DESCRIPTION
Test evaluates the expression expr. If the value is true the exit status is null; otherwise the exit status is non-null. If there are no
arguments the exit status is non-null.
The following primitives are used to construct expr.
-r file True if the file exists (is accessible) and is readable.
-w file True if the file exists and is writable.
-x file True if the file exists and has execute permission.
-e file True if the file exists.
-f file True if the file exists and is a plain file.
-d file True if the file exists and is a directory.
-s file True if the file exists and has a size greater than zero.
-t fildes True if the open file whose file descriptor number is fildes (1 by default) is the same file as /dev/cons.
-A file True if the file exists and is append-only.
-L file True if the file exists and is exclusive-use.
-Tfile True if the file exists and is temporary.
s1 = s2 True if the strings s1 and s2 are identical.
s1 != s2 True if the strings s1 and s2 are not identical.
s1 True if s1 is not the null string. (Deprecated.)
-n s1 True if the length of string s1 is non-zero.
-z s1 True if the length of string s1 is zero.
n1 -eq n2 True if the integers n1 and n2 are arithmetically equal. Any of the comparisons -ne, -gt, -ge, -lt, or -le may be used in place
of -eq. The (nonstandard) construct -l string, meaning the length of string, may be used in place of an integer.
a -nt b True if file a is newer than (modified after) file b.
a -ot b True if file a is older than (modified before) file b.
f -older t True if file f is older than (modified before) time t. If t is a integer followed by the letters y(years), M(months), d(days),
h(hours), m(minutes), or s(seconds), it represents current time minus the specified time. If there is no letter, it represents
seconds since epoch. You can also concatenate mixed units. For example, 3d12h means three days and twelve hours ago.
These primaries may be combined with the following operators:
! unary negation operator
-o binary or operator
-a binary and operator; higher precedence than -o
( expr ) parentheses for grouping.
The primitives -b, -u, -g, and -s return false; they are recognized for compatibility with POSIX.
Notice that all the operators and flags are separate arguments to test. Notice also that parentheses and equal signs are meaningful to rc
and must be enclosed in quotes.
EXAMPLES
Test is a dubious way to check for specific character strings: it uses a process to do what an rc(1) match or switch statement can do. The
first example is not only inefficient but wrong, because test understands the purported string "-c" as an option.
if (test $1 '=' "-c") echo OK # wrong!
A better way is
if (~ $1 -c) echo OK
Test whether is in the current directory.
test -f abc -o -d abc
SOURCE
/src/cmd/test.c
SEE ALSO
rc(1)
TEST(1)