• https://www.cs.uleth.ca/~holzmann/C/shells/csh_avoidit.html

loop

• Unix: csh Shell Loop Example

• loop over directories in cshell

#!/bin/csh
set z="/a/b/c/"
foreach i (`ls -d $z`)
 echo $i
end

string

extract chars

• Get first character of a string SHELL

upper case / lower case

• [Solved] Change Upper case to Lower case in C shell

set ac `echo $AC | tr "[:upper:]" "[:lower:]"`

file

absolute path

• How to retrieve absolute path given relative

readlink -f relative_file_name

• Converting relative path into absolute path?

ABS_PATH=`cd "$1"; pwd`

IO redirect

• Redirect stderr to stdout in C shell

# redirect both standard output and error to a file with:
xxx >& filename

if

• Shell script to search for a pattern in a file using if else

if ( { grep -q 'Pattern' file } ) then
  echo "Pattern found"
else
  echo "Pattern not found"
endif

grep -q 'Pattern' file
if ( $status == 0 ) then
  echo "Pattern found"
else
  echo "Pattern not found"
endif

PATH

• set path in tcsh

set path = ($path /usr/local/bin)

history

• How do I set an unlimited size to the history file for tcsh?

set history = 2000          # History remembered is 2000
set savehist = (2000 merge) # Save and merge with existing saved 
set histfile = ~/.tcsh_history
 ...in .tcshrc and this line... 
history -S
 ...in .logout solved the problem.