Longhand using builtins only and no pipes:-
(OSX 10.7.5 default bash terminal.)
I hate to bring the bad news but this is a subshell, not a builtin. This way your script takes perhaps eons more than any single pipeline (which is pretty similar to a subshell call).
Your idea can be realized using builtins only, like this (the following uses ksh88, but should work in bash the same way):
I hope this helps.
bakunin
These 2 Users Gave Thanks to bakunin For This Post:
I'm having trouble manipulating a string that contains single quotes (') in it. I'm writing a ksh script to parse in a few queries from a config file, such as this:
findbug \(\(Project 'in' "Deployment,HDRCI,LHS,LSS,WUCI" '&&' Status 'in' "N" '&&' New_on 'lessthan' "070107" \)\) '&&' \(Class... (9 Replies)
I need to count the number of files which have a search string, but counting the file only once
if search string is found.
eg: File1: Please note that there are 2 occurances of "aaa"
aaa
bbb
ccc
aaa
File2: Please note that there are 3 occurances of "aaa"
aaa
bbb
ccc... (1 Reply)
I'm not very familiar with the ssh command. When I tried to set a variable and then echo its value on a remote machine via ssh, I found a problem. For example,
$ ITSME=itsme
$ ssh xxx.xxxx.xxx.xxx "ITSME=itsyou; echo $ITSME"
itsme
$ ssh xxx.xxxx.xxx.xxx 'ITSME=itsyou; echo $ITSME'
itsyou
$... (3 Replies)
Hi All, I love this site, it helps newbie people like me and I appreciate everyone's help!
Here is my questions.
I am trying to concatenate a single quote into a character/string from a text file for each line (lets say ABC should look like 'ABC').
I tried to use awk print command to do... (1 Reply)
Hi,
I am trying out different scripts in PERL. I want to take a line/string as an input from the user and count the number of occurrances of all the alphabets (a..z) in the string. I tried doingit like this :
#! /opt/exp/bin/perl
print "Enter a string or line : ";
$string = <STDIN>;
chop... (5 Replies)
Unix superusers,
I am new to unix but would like to learn more about grep. I am very familiar with regular expressions as i have used them for searching text files in windows based text editors. Since I am not very familiar with Unix, I dont understand when one should use GREP with the... (2 Replies)
Hello. I'm trying to write a bash script that uses GNU screen and have hit a brick wall that has cost me many hours... (I'm sure it has something to do with quoting/globbing, which is why I post it here)
I can make a script that does the following just fine:
test.sh:
#!/bin/bash
# make... (2 Replies)
HI,
i have a file like this
t.txt
f1|_f2|_
f1|_f2|_
f1|_f2|_
as if col delimiter is |_ and row delimiter |_\n
trying to count number of records using awk
$ awk 'BEGIN{FS="|_" ; RS="~~\n"} {n++}END{print n} ' t.txt
7
wondering how can i count this to 3 ?
thx (9 Replies)
Hi,
Trying to change the prompt. I have the following code.
export PS1='
<${USER}@`hostname -s`>$ '
The hostname is not displayed
<abc@`hostname -s`>$ uname -a
AIX xyz 1 6 00F736154C00
<adcwl4h@`hostname -s`>$
If I use double quotes, then the hostname is printed properly but... (3 Replies)
Hi Froum.
I have tried in vain to find a solution for this problem - I'm trying to replace any double quotes within a quoted string with a single quote, leaving everything else as is.
I have the following data:
Before:
... (32 Replies)
Discussion started by: pchang
32 Replies
LEARN ABOUT DEBIAN
rbash
RBASH(1) General Commands Manual RBASH(1)NAME
rbash - restricted bash, see bash(1)RESTRICTED SHELL
If bash is started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted. A restricted shell is
used to set up an environment more controlled than the standard shell. It behaves identically to bash with the exception that the follow-
ing are disallowed or not performed:
o changing directories with cd
o setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV
o specifying command names containing /
o specifying a file name containing a / as an argument to the . builtin command
o specifying a filename containing a slash as an argument to the -p option to the hash builtin command
o importing function definitions from the shell environment at startup
o parsing the value of SHELLOPTS from the shell environment at startup
o redirecting output using the >, >|, <>, >&, &>, and >> redirection operators
o using the exec builtin command to replace the shell with another command
o adding or deleting builtin commands with the -f and -d options to the enable builtin command
o using the enable builtin command to enable disabled shell builtins
o specifying the -p option to the command builtin command
o turning off restricted mode with set +r or set +o restricted.
These restrictions are enforced after any startup files are read.
When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script.
SEE ALSO bash(1)GNU Bash-4.0 2004 Apr 20 RBASH(1)