hi,I am new to shell script,I have String,like this:
Number of rows exported: 5321
the numbe at end could changing,how can I extract this number and assign it to a variable,then use it later in script.
thanks. (19 Replies)
Is there any way to print all the string till we get a space and a number and store it a variable
for eg we have string java.io.IOException: An existing connection was forcibly closed by the remote host 12
All I want is to store "java.io.IOException: An existing connection was forcibly closed... (13 Replies)
I need to add space to certain directory. I believe I need to add space to the filesystem this directory belongs to. How can I find out what filesystem this directory belongs to? (3 Replies)
Hi,
I need to generate the text name dynamically in for loop,
ex,
VAR_COPY_FILE1= file path 1
VAR_COPY_FILE2= file path 2
VAR_COPY_FILE3= file path 3
for i in 1 2 3
do
if
then
"do some process here"
fi
done (3 Replies)
I am parsing a file and I get differnt results everytime.
Sometimes I get 12s sometimes I get 54m and sometime 3h..
v1=12s or v1=54m or v1=3h
12s - 12 seconds
54m - 54 minutes
3h - 3 hour
I have to write a script in such a way that it whenever v1 is in minutes,
I should strip "m"... (14 Replies)
I need to remove double quoted strings from specific lines in a file. The specific line numbers are a variable. For example, line 5 of the file contains
A B C "string"
I want to remove "string". The following sed command works:
sed '5 s/\"*\"//' $file
If there are multiple... (2 Replies)
Hi All,
I have a file test.txt.
Content of test.txt :
1 vinay se
2 kumar sse
4 kishore tl
I am extracting the content of file with below command.
awk '$2 ~ "vinay" {print $0}' test.txt
Now instead of hardcoding $2 is there any way pass $2 as variable and compare with a... (7 Replies)
Hi,
I am wanting to create a script that will construct a SQL statement based on a a space delimited string that it read from a config file.
Example of the SQL will be
For example, it will read a string like "AAA BBB CCC" and assign to a variable named IN_STRING.
I then concatenate... (2 Replies)
I have two files, file1 and file2 who have identical number of rows and columns. However, the script is supposed to be used for for different files and I cannot know the format in advance. Also, the number of columns changes within the file, some rows have more and some less columns (they are... (13 Replies)
Discussion started by: maya3
13 Replies
LEARN ABOUT MOJAVE
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}}
returns "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)