WebAug 6, 2024 · If you also want to match when the number is the last one on the line, so it has no , after it, you can use grep -E to enable extended regular expressions and then match either a 329 followed by a comma ( 329,) or a 329 that is at the end of the line ( 329$ ). You can combine those like this: WebJan 16, 2024 · In this article, we will write a bash script to check if files exist or not. Syntax : test [expression] [ expression ] [ [ expression ]] Here, in expression, we write parameter and file name. Let us see some parameters that can be used in the expression: – – f: It returns True if the file exists as a common ( regular ) file.
How to find out whether a shell script is written in bash or …
WebActually isn't /bin/sh guaranteed to point to korn-compatible shell while tcsh is csh-derived shell. It is likely that /bin/sh already points to bash or other compatible shell and it is nearly certain it won't be affected by changing of user shell. csh and sh are completly uncompatible. – Dec 27, 2010 at 18:49 2 I'm not sure what is guaranteed. WebJun 26, 2015 · For ksh, zsh and bash, a potentially better approach could be: if ( ($ {#var [@]})); then echo '$var (or the variable it references for namerefs) or any of its elements for array/hashes has been set' fi For ksh93, zsh and bash 4.4 or above, there's also: if typeset -p var 2> /dev/null grep -q '^'; then echo '$var exists' fi the godmother by hannelore cayre
csh - C Shell script condition for if string contains a newline ...
WebAug 28, 2024 · Alternatively, you can use the $status variable: grep -q 'Pattern' file if ( $status == 0 ) then echo "Pattern found" else echo "Pattern not found" endif In tcsh, the variable $status may be replaced by $? - but not all csh implementations appear to support this. Share Improve this answer Follow edited Aug 28, 2024 at 15:47 WebCheck for $BASH_VERSION, $ZSH_VERSION, and other shell-specific variables. Check $SHELL; this is a last resort, as it specifies your default shell and not necessarily the current shell. Share Improve this answer edited Sep 11, 2024 at 8:05 tomglynch 103 3 answered Mar 18, 2011 at 2:12 geekosaur 31.1k 5 79 57 8 Should you mention $0 too? … WebJan 18, 2024 · Syntax to find out if file exists with conditional expressions in a Bash Shell The general syntax is as follows: [ parameter FILE ] OR test parameter FILE OR [ [ parameter FILE ]] Where parameter can be any one of the following: -e: Returns true value if file exists. -f: Return true value if file exists and regular file. theater chemnitz othello abgesagt