I understand how to use a variable in a sed command, but for the life of me I can't get the output into a variable.
I'm making a general function to replace part of a filename with a different string, so:
>>myscript this that
would change:
this_file001.txt to that_file001.txt and... (11 Replies)
Hi there!
I'm trying to write a script that will capture output from a command and assign it to a variable.
Let's say, for example, I'd like to catch from inside the script whatever the following command outputs:
ls *.aaa
and put it into a variable "listoffiles".
What I tried was:
set... (3 Replies)
Hi All,
Hope someone can advise here as I have been struggling to find a syntax that works here. I have tried a stack of combination I have seed in the forums but I think because I have needed to use "" and `` in the statments another method is found.
I am reading in lines with the following... (1 Reply)
I have a variable $WORDS that contains a string
Then i want to use sed to break it up.
echo $WORDS | sed 's// /g'
I tried setting this as a variable by doing
WORDS2=`echo $WORDS | sed 's// /g'`
But when i do this it does not return me to the prompt properly
ie.
jmpprd-v1>
jmpprd-v1>... (4 Replies)
Stumped with the formatting of the awk output when used with variables, e.g.:
awk -F, 'BEGIN {OFS=","} print {$2,$3,$4}' $infile1
produces the desired output (with rows), but when echoing the variable below, the output is one continuous line
var1=$(awk -F, 'BEGIN {OFS=","} print... (4 Replies)
I'm trying to echo the release version of some of our Linux servers. Typically I do these types of things by "catting" a text file with the host names, "ssh-ing" to the host and running my string.
This is what I've written
for i in `cat versions.txt` ; do echo $i ; ssh $i cat /etc/issue |... (5 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
2. Relevant commands, code, scripts, algorithms:
#! /bin/ksh
v="ORG_ID"
... (2 Replies)
Hi,
I have some 2000 names in a table like below.
Java
Oracle/SQL
ANSI SQL
SQL,DWH,DB
DB&Java
And by using for loop in my code i am able to get a single word but if there is any special character or space then it is considering as a next line.
I have to execute the below queries in... (10 Replies)
I don't know why, but the rendering of my code mucks up the spacing and indentation, despite being correct in the original file. I'm having issues getting the following script to run (specifically the nested script at the end of the docker command near the end of the script; I think I'm not passing... (2 Replies)
How can I pass bash Variable to python script.
bash.sh
while read -r db
do
Printf "%s\n" ${db} "Found"
done < path/to/file.txt
file.txt
db1
db2
db3
python.py
print(${db}_tables.replicate.fix) (2 Replies)
Discussion started by: lpoolfc
2 Replies
LEARN ABOUT OPENDARWIN
subst
subst(n) Tcl Built-In Commands subst(n)
__________________________________________________________________________________________________________________________________________________NAME
subst - Perform backslash, command, and variable substitutions
SYNOPSIS
subst ?-nobackslashes? ?-nocommands? ?-novariables? string
_________________________________________________________________DESCRIPTION
This command performs variable substitutions, command substitutions, and backslash substitutions on its string argument and returns the
fully-substituted result. The substitutions are performed in exactly the same way as for Tcl commands. As a result, the string argument
is actually substituted twice, once by the Tcl parser in the usual fashion for Tcl commands, and again by the subst command.
If any of the -nobackslashes, -nocommands, or -novariables are specified, then the corresponding substitutions are not performed. For
example, if -nocommands is specified, command substitution is not performed: open and close brackets are treated as ordinary characters
with no special interpretation.
Note that the substitution of one kind can include substitution of other kinds. For example, even when the -novariables option is speci- |
fied, command substitution is performed without restriction. This means that any variable substitution necessary to complete the command |
substitution will still take place. Likewise, any command substitution necessary to complete a variable substitution will take place, even |
when -nocommands is specified. See the EXAMPLES below. |
If an error occurs during substitution, then subst will return that error. If a break exception occurs during command or variable substi- |
tution, the result of the whole substitution will be the string (as substituted) up to the start of the substitution that raised the excep- |
tion. If a continue exception occurs during the evaluation of a command or variable substitution, an empty string will be substituted for |
that entire command or variable substitution (as long as it is well-formed Tcl.) If a return exception occurs, or any other return code is |
returned during command or variable substitution, then the returned value is substituted for that substitution. See the EXAMPLES below. |
In this way, all exceptional return codes are ``caught'' by subst. The subst command itself will either return an error, or will complete |
successfully.
EXAMPLES
When it performs its substitutions, subst does not give any special treatment to double quotes or curly braces (except within command sub-
stitutions) so the script
set a 44
subst {xyz {$a}}
returns ``xyz {44}'', not ``xyz {$a}'' and the script |
set a "p} q {r" |
subst {xyz {$a}} |
return ``xyz {p} q {r}'', not ``xyz {p} q {r}''. |
When command substitution is performed, it includes any variable substitution necessary to evaluate the script. |
set a 44 |
subst -novariables {$a [format $a]} |
returns ``$a 44'', not ``$a $a''. Similarly, when variable substitution is performed, it includes any command substitution necessary to |
retrieve the value of the variable. |
proc b {} {return c} |
array set a {c c [b] tricky} |
subst -nocommands {[b] $a([b])} |
returns ``[b] c'', not ``[b] tricky''. |
The continue and break exceptions allow command substitutions to prevent substitution of the rest of the command substitution and the rest |
of string respectively, giving script authors more options when processing text using subst. For example, the script |
subst {abc,[break],def} |
returns ``abc,'', not ``abc,,def'' and the script |
subst {abc,[continue;expr 1+2],def} |
returns ``abc,,def'', not ``abc,3,def''. |
Other exceptional return codes substitute the returned value |
subst {abc,[return foo;expr 1+2],def} |
returns ``abc,foo,def'', not ``abc,3,def'' and |
subst {abc,[return -code 10 foo;expr 1+2],def} |
also returns ``abc,foo,def'', not ``abc,3,def''.
SEE ALSO
Tcl(n), eval(n), break(n), continue(n)
KEYWORDS
backslash substitution, command substitution, variable substitution
Tcl 7.4 subst(n)